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2. Multiple impacts of invasive species on species at risk: a case study in British Columbia, Canada

Author

Tamburello, Natascia and Litt, M. Aline

Abstract

Invasive species are a leading cause of biodiversity loss and species extinctions across ecosystems on a global scale. The historical and ongoing focus on single-species management of invasive species and species at risk contributes to inefficiencies in management strategies that present an obstacle to achieving desired outcomes. A holistic approach that consolidates and maps linkages between the broader collective of invasive species and species at risk in an area provides a more appropriate entry point for issue-based, rather than species-based, management planning. We present a case study of this approach from British Columbia, Canada, which synthesized the identity, mechanisms of impact, mechanisms of spread, and magnitude of impacts across 782 unique pairs of invasive species and federally listed species at risk, based on a literature review of species at risk documentation. The resulting dataset was used to summarize the nature of interactions across species pairs and taxonomic groups to help guide the development of invasive species response strategies that make the best use of limited management resources. As species invasions and extinctions become increasingly interconnected, holistic approaches rooted in cumulative effects assessment and ecosystem-based management can provide a stronger foundation for reducing or mitigating this growing threat.

Published
2023
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13. Surface-layer turbulence, energy balance and links to atmospheric circulations over a mountain glacier in the French Alps

Author

Litt, M., Sicart, Jean-Emmanuel, Six, D., Wagnon, Patrick, and Helgason, W. D.

Subjects
Physics::Fluid Dynamics, lcsh:GE1-350, lcsh:Geology, lcsh:QE1-996.5, Physics::Atmospheric and Oceanic Physics, lcsh:Environmental sciences
Abstract

Over Saint-Sorlin Glacier in the French Alps (45 degrees N, 6.1 degrees E; similar to 3 km(2)) in summer, we study the atmospheric surface-layer dynamics, turbulent fluxes, their uncertainties and their impact on surface energy balance (SEB) melt estimates. Results are classified with regard to largescale forcing. We use high-frequency eddy-covariance data and mean air-temperature and wind-speed vertical profiles, collected in 2006 and 2009 in the glacier's atmospheric surface layer. We evaluate the turbulent fluxes with the eddycovariance (sonic) and the profile method, and random errors and parametric uncertainties are evaluated by including different stability corrections and assuming different values for surface roughness lengths. For weak synoptic forcing, local thermal effects dominate the wind circulation. On the glacier, weak katabatic flows with a wind-speed maximum at low height (2-3 m) are detected 71% of the time and are generally associated with small turbulent kinetic energy (TKE) and small net turbulent fluxes. Radiative fluxes dominate the SEB. When the large-scale forcing is strong, the wind in the valley aligns with the glacier flow, intense downslope flows are observed, no wind-speed maximum is visible below 5 m, and TKE and net turbulent fluxes are often intense. The net turbulent fluxes contribute significantly to the SEB. The surface-layer turbulence production is probably not at equilibrium with dissipation because of interactions of largescale orographic disturbances with the flow when the forcing is strong or low-frequency oscillations of the katabatic flow when the forcing is weak. In weak forcing when TKE is low, all turbulent fluxes calculation methods provide similar fluxes. In strong forcing when TKE is large, the choice of roughness lengths impacts strongly the net turbulent fluxes from the profile method fluxes and their uncertainties. However, the uncertainty on the total SEB remains too high with regard to the net observed melt to be able to recommend one turbulent flux calculation method over another.

Published
2017

16. Measurements, models and drivers of incoming longwave radiation in the Himalaya

Author

de Kok, R. J., Steiner, J. F., Litt, M., Wagnon, Patrick, Koch, I., Azam, M. F., and Immerzeel, W. W.

Subjects
Himalaya, glaciers, snow, melt, longwave radiation
Abstract

Melting snow and glacier ice in the Himalaya forms an important source of water for people downstream. Incoming longwave radiation (LWin) is an important energy source for melt, but there are only few measurements of LWin at high elevation. For the modelling of snow and glacier melt, the LWin is therefore often represented by parameterizations that were originally developed for lower elevation environments. With LWin measurements at eight stations in three catchments in the Himalaya, with elevations between 3,980 and 6,352 m.a.s.l., we test existing LWin parameterizations. We find that these parameterizations generally underestimate the LWin, especially in wet (monsoon) conditions, where clouds are abundant and locally formed. We present a new parameterization based only on near-surface temperature and relative humidity, both of which are easy and inexpensive to measure accurately. The new parameterization performs better than the parameterizations available in literature, in some cases halving the root-mean-squared error. The new parameterization is especially improving existing parameterizations in cloudy conditions. We also show that the choice of longwave parameterization strongly affects melt calculations of snow and ice.

Published
2019

24. Mortality following cardiovascular and bleeding events occurring beyond 1 year after coronary stenting: A secondary analysis of the Dual Antiplatelet Therapy (DAPT) Study.

Author

Hopkins J., McGarry T., Nygaard T., Pow T., Larkin T., Caulfield T., Stys T., Lee T., Mansouri V., Srinivas V., Gupta V., Marquardt W., Ballard W., Bachinsky W., Colyer W., Dillon W., Felten W., French W., Kuehl W., Nicholas W., Nicholson W., Phillips W., Khatib Y., Al-Saghir Y., Hawa Z., Masud Z., Jafar Z., Muller D., Meredith I., Rankin J., Worthley M., Jepson N., Thompson P., Hendriks R., Whitbourn R., Duffy S., Stasek J., Novobilsky K., Naplava R., Coufal Z., Vaquette B., Bressollette E., Teiger E., Coste P., Rihani R., Darius H., Bergmann M.W., Radke P., Sebastian P., Strasser R., Hoffmann S., Behrens S., Moebius-Winkler S., Rutsch W., Lupkovics G., Horvath I., Kancz S., Forster T., Koszegi Z., Devlin G., Hart H., Elliott J., Ormiston J., Abernathy M., Fisher N., Kay P., Harding S., Jaffe W., Hoffmann A., Sosnowski C., Trebacz J., Buszman P., Dobrzycki S., Kornacewicz-Jach Z., Iancu A.C., Ginghina C.D., Matei C., Dobreanu D., Bolohan F.R., Dorobantu M., Jacques A., Jain A., Bakhai A., Gershlick A., Adamson D., Newby D., Felmeden D., Purcell I., Edmond J., Irving J., De Belder M., Pitt M., Kelly P., O'Kane P., Clifford P., Suresh V., Secemsky E.A., Yeh R.W., Kereiakes D.J., Cutlip D.E., Cohen D.J., Steg P.G., Cannon C.P., Apruzzese P.K., D'Agostino R.B., Massaro J.M., Mauri L., Kaplan A., Ahmed A., Ahmed A.-H., Albirini A., Moreyra A., Rabinowitz A., Shroff A., Moak A., Jacobs A., Kabour A., Gupta A., Irimpen A., Rosenthal A., Taussig A., Ferraro A., Chhabra A., Pucillo A., Spaedy A., White A., Pratsos A., Shakir A., Ghitis A., Agarwal A., Chawla A., Tang A., Barker B., Bertolet B., Uretsky B., Erickson B., Rama B., McLaurin B., Dearing B., Negus B., Price B., Brott B., Bhambi B., Bowers B., Watt B., Donohue B., Hassel C.D., Croft C., Lambert C., O'Shaughnessy C., Shoultz C., Kim C., Caputo C., Nielson C., Scott C., Wolfe C., McKenzie C., Brachfeld C., Thieling C., Fisher D., Simon D., Churchill D., Dobies D., Eich D., Goldberg D., Griffin D., Henderson D., Kandzari D., Lee D., Lewis D., Mego D., Paniagua D., Rizik D., Roberts D., Safley D., Abbott D., Shaw D., Temizer D., Canaday D., Myears D., Westerhausen D., Ebersole D., Netz D., Baldwin D., Letts D., Harlamert E., Kosinski E., Portnay E., Mahmud E., Korban E., Hockstad E., Rivera E., Shawl F., Shamoon F., Kiernan F., Aycock G.R., Schaer G., Kunz G., Kichura G., Myers G., Pilcher G., Tadros G., Kaddissi G.I., Ramadurai G., Eaton G., Elsner G., Mishkel G., Simonian G., Piegari G., Chen H., Liberman H., Aronow H., Tamboli H.P., Dotani I., Marin J., Fleischhauer J.F., Leggett J., Mills J., Phillips J., Revenaugh J., Mann J.T., Wilson J., Pattanayak J., Aji J., Strain J., Patel J., Carr J., Moses J., Chen J.-C., Williams J., Greenberg J., Cohn J., Douglas J., Gordon J., Griffin J., Hawkins J., Katopodis J., Lopez J., Marshall J., Wang J., Waltman J., Saucedo J., Galichia J., McClure M., Kozina J., Stella J., Tuma J., Kieval J., Giri K., Ramanathan K., Allen K., Atassi K., Baran K., Khaw K., Clayton K., Croce K., Skelding K., Patel K., Garratt K., Harjai K., Chandrasekhar K., Kalapatapu K., Lin L., Dean L., Barr L., MacDonald L., Cannon L., Satler L., Gruberg L., Tami L., Bikkina M., Shah M., Atieh M., Chauhan M., Litt M., Unterman M., Lechin M., Zughaib M., Fisch M., Grabarczyk M., Greenberg M., Lurie M., Rothenberg M., Stewart M., Purvis M., Hook M., Leesar M., Buchbinder M., Weiss M., Guerrero M., Abu-Fadel M., Ball M., Chang M., Cunningham M., Del Core M., Jones M., Kelberman M., Lim M., Ragosta M., Rinaldi M., Rosenberg M., Savage M., Tamberella M., Kellett M., Vidovich M., Effat M., Mirza M.A., Khan M., Dib N., Laufer N., Kleiman N., Farhat N., Amjadi N., Schechtmann N., Bladuell N., Quintana O., Gigliotti O., Best P., Flaherty P., Hall P., Gordon P., Gurbel P., Ho P., Luetmer P., Mahoney P., Mullen P., Teirstein P., Tolerico P., Ramanathan P., Kerwin P., Lee P.V., Kraft P., Wyman R.M., Gonzalez R., Kamineni R., Dave R., Sharma R., Prashad R., Aycock R., Quesada R., Goodroe R., Magorien R., Randolph R., Bach R., Kettelkamp R., Paulus R., Waters R., Zelman R., Ganim R., Bashir R., Applegate R., Feldman R., Frankel R., Hibbard R., Jobe R., Jumper R., Maholic R., Siegel R., Smith R., Stoler R., Watson R., Wheatley R., Gammon R., Hill R., Sundrani R., Caputo R., Jenkins R., Stella R., Germanwala S., Hadeed S., Ledford S., Dube S., Gupta S., Davis S., Martin S., Waxman S., Dixon S., Naidu S., Potluri S., Cook S., Crowley S., Kirkland S., McIntyre S., Thew S., Lin S., Marshalko S., Guidera S., Hearne S., Karas S., Manoukian S., Rowe S., Yakubov S., Pollock S., Banerjee S., Allaqaband S., Choi S., Mulukutla S., Papadakos S., Bajwa T., Addo T., Schreiber T., Haldis T., Mathew T., Hopkins J., McGarry T., Nygaard T., Pow T., Larkin T., Caulfield T., Stys T., Lee T., Mansouri V., Srinivas V., Gupta V., Marquardt W., Ballard W., Bachinsky W., Colyer W., Dillon W., Felten W., French W., Kuehl W., Nicholas W., Nicholson W., Phillips W., Khatib Y., Al-Saghir Y., Hawa Z., Masud Z., Jafar Z., Muller D., Meredith I., Rankin J., Worthley M., Jepson N., Thompson P., Hendriks R., Whitbourn R., Duffy S., Stasek J., Novobilsky K., Naplava R., Coufal Z., Vaquette B., Bressollette E., Teiger E., Coste P., Rihani R., Darius H., Bergmann M.W., Radke P., Sebastian P., Strasser R., Hoffmann S., Behrens S., Moebius-Winkler S., Rutsch W., Lupkovics G., Horvath I., Kancz S., Forster T., Koszegi Z., Devlin G., Hart H., Elliott J., Ormiston J., Abernathy M., Fisher N., Kay P., Harding S., Jaffe W., Hoffmann A., Sosnowski C., Trebacz J., Buszman P., Dobrzycki S., Kornacewicz-Jach Z., Iancu A.C., Ginghina C.D., Matei C., Dobreanu D., Bolohan F.R., Dorobantu M., Jacques A., Jain A., Bakhai A., Gershlick A., Adamson D., Newby D., Felmeden D., Purcell I., Edmond J., Irving J., De Belder M., Pitt M., Kelly P., O'Kane P., Clifford P., Suresh V., Secemsky E.A., Yeh R.W., Kereiakes D.J., Cutlip D.E., Cohen D.J., Steg P.G., Cannon C.P., Apruzzese P.K., D'Agostino R.B., Massaro J.M., Mauri L., Kaplan A., Ahmed A., Ahmed A.-H., Albirini A., Moreyra A., Rabinowitz A., Shroff A., Moak A., Jacobs A., Kabour A., Gupta A., Irimpen A., Rosenthal A., Taussig A., Ferraro A., Chhabra A., Pucillo A., Spaedy A., White A., Pratsos A., Shakir A., Ghitis A., Agarwal A., Chawla A., Tang A., Barker B., Bertolet B., Uretsky B., Erickson B., Rama B., McLaurin B., Dearing B., Negus B., Price B., Brott B., Bhambi B., Bowers B., Watt B., Donohue B., Hassel C.D., Croft C., Lambert C., O'Shaughnessy C., Shoultz C., Kim C., Caputo C., Nielson C., Scott C., Wolfe C., McKenzie C., Brachfeld C., Thieling C., Fisher D., Simon D., Churchill D., Dobies D., Eich D., Goldberg D., Griffin D., Henderson D., Kandzari D., Lee D., Lewis D., Mego D., Paniagua D., Rizik D., Roberts D., Safley D., Abbott D., Shaw D., Temizer D., Canaday D., Myears D., Westerhausen D., Ebersole D., Netz D., Baldwin D., Letts D., Harlamert E., Kosinski E., Portnay E., Mahmud E., Korban E., Hockstad E., Rivera E., Shawl F., Shamoon F., Kiernan F., Aycock G.R., Schaer G., Kunz G., Kichura G., Myers G., Pilcher G., Tadros G., Kaddissi G.I., Ramadurai G., Eaton G., Elsner G., Mishkel G., Simonian G., Piegari G., Chen H., Liberman H., Aronow H., Tamboli H.P., Dotani I., Marin J., Fleischhauer J.F., Leggett J., Mills J., Phillips J., Revenaugh J., Mann J.T., Wilson J., Pattanayak J., Aji J., Strain J., Patel J., Carr J., Moses J., Chen J.-C., Williams J., Greenberg J., Cohn J., Douglas J., Gordon J., Griffin J., Hawkins J., Katopodis J., Lopez J., Marshall J., Wang J., Waltman J., Saucedo J., Galichia J., McClure M., Kozina J., Stella J., Tuma J., Kieval J., Giri K., Ramanathan K., Allen K., Atassi K., Baran K., Khaw K., Clayton K., Croce K., Skelding K., Patel K., Garratt K., Harjai K., Chandrasekhar K., Kalapatapu K., Lin L., Dean L., Barr L., MacDonald L., Cannon L., Satler L., Gruberg L., Tami L., Bikkina M., Shah M., Atieh M., Chauhan M., Litt M., Unterman M., Lechin M., Zughaib M., Fisch M., Grabarczyk M., Greenberg M., Lurie M., Rothenberg M., Stewart M., Purvis M., Hook M., Leesar M., Buchbinder M., Weiss M., Guerrero M., Abu-Fadel M., Ball M., Chang M., Cunningham M., Del Core M., Jones M., Kelberman M., Lim M., Ragosta M., Rinaldi M., Rosenberg M., Savage M., Tamberella M., Kellett M., Vidovich M., Effat M., Mirza M.A., Khan M., Dib N., Laufer N., Kleiman N., Farhat N., Amjadi N., Schechtmann N., Bladuell N., Quintana O., Gigliotti O., Best P., Flaherty P., Hall P., Gordon P., Gurbel P., Ho P., Luetmer P., Mahoney P., Mullen P., Teirstein P., Tolerico P., Ramanathan P., Kerwin P., Lee P.V., Kraft P., Wyman R.M., Gonzalez R., Kamineni R., Dave R., Sharma R., Prashad R., Aycock R., Quesada R., Goodroe R., Magorien R., Randolph R., Bach R., Kettelkamp R., Paulus R., Waters R., Zelman R., Ganim R., Bashir R., Applegate R., Feldman R., Frankel R., Hibbard R., Jobe R., Jumper R., Maholic R., Siegel R., Smith R., Stoler R., Watson R., Wheatley R., Gammon R., Hill R., Sundrani R., Caputo R., Jenkins R., Stella R., Germanwala S., Hadeed S., Ledford S., Dube S., Gupta S., Davis S., Martin S., Waxman S., Dixon S., Naidu S., Potluri S., Cook S., Crowley S., Kirkland S., McIntyre S., Thew S., Lin S., Marshalko S., Guidera S., Hearne S., Karas S., Manoukian S., Rowe S., Yakubov S., Pollock S., Banerjee S., Allaqaband S., Choi S., Mulukutla S., Papadakos S., Bajwa T., Addo T., Schreiber T., Haldis T., and Mathew T.

Abstract

Importance: Early cardiovascular and bleeding events after coronary stenting are associated with high risk of morbidity and mortality. Objective(s): To assess the prognosis of cardiovascular and bleeding events occurring beyond 1 year after coronary stenting. Design, Setting, and Participant(s): This secondary analysis is derived from data from the Dual Antiplatelet Therapy (DAPT) Study, a multi center trial involving 220 US and in ternational clinical sites from 11 countries. The study dateswere August 2009 to May 2014. Individuals who underwent coronary stenting and completed 12 months of thienopyridine plus aspirin therapy without ischemic or bleeding events remained on an aspirin regimen and were randomized to continued thienopyridine therapy vs placebo for 18 additional months. Individuals were then followed up for 3 additional months while receiving aspirin therapy alone. The analysis began in August 2015. Exposures: Ischemic events (myocardial infarction not related to stent thrombosis, stent thrombosis, and ischemic stroke) and bleeding events (Global Utilization of Streptokinase and Tissue Plasminogen Activator for Occluded Arteries [GUSTO] classification moderate or severe bleeding). Main Outcomes and Measures: Ischemic events (myocardial infarction not related to stent thrombosis, stent thrombosis, and ischemic stroke) and bleeding events (GUSTO classification moderate or severe bleeding). Death at 21 months after randomization (33 months after coronary stenting). Result(s): Intotal, 25 682 individuals older than 18 years with an indication for coronarystentingwere enrolled, and 11 648(meanage,61.3 years; 25.1%female)were randomized. After randomization, 478 individuals (4.1%) had 502 ischemic events (306 with myocardial infarction, 113 with stent thrombosis, and 83 with ischemic stroke), and 232 individuals (2.0%) had 235 bleeding events (155 with moderate and 80 with severe bleeding). Among individuals with ischemic events, 52(10.9%) died. The annualize

Published
2017

32. Turbulence characteristics in the atmospheric surface layer for different wind regimes over the tropical Zongo glacier (Bolivia,16 degrees S)

Author

Litt, M., Sicart, Jean-Emmanuel, Helgason, W. D., and Wagnon, Patrick

Subjects
Katabatic wind, Coherent structures, Astrophysics::High Energy Astrophysical Phenomena, Tropical glaciers, Physics::Space Physics, Eddy covariance, Energy balance, Physics::Atmospheric and Oceanic Physics
Abstract

We investigate properties of the turbulent flow and sensible heat fluxes in the atmospheric surface layer of the high elevation tropical Zongo glacier ( m a.s.l., S, Bolivia) from data collected in the dry season from July to August 2007, with an eddy-covariance system and a 6-m mast for wind speed and temperature profiles. Focus is on the predominant downslope wind regime. A low-level wind-speed maximum, around a height of m, is detected in low wind conditions (37 % of the time). In strong wind conditions (39 % of the time), no wind-speed maximum is detected. Statistical and spectral analyses reveal low frequency oscillations of the horizontal wind speed that increase vertical mixing. In strong winds, wavelet analysis shows that coherent structures systematically enhance the turbulent sensible heat fluxes, accounting for 44-52 % of the flux. In contrast, in low wind conditions, the katabatic flow is perturbed by its slow oscillations or meandering motions, inducing erratic turbulent sensible heat fluxes. These motions account for 37-43 % of the flux. On tropical glaciers, the commonly used bulk aerodynamic profile method underestimates the eddy-covariance-based flux, probably because it does not account for low frequency disturbances that influence the surface flow in both wind regimes.

Published
2015

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