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17 results on '"Tolman, H. L."'

1. Effects of the Gulf Stream on ocean waves

Author

Holthuijsen, L. H and Tolman, H. L

Subjects
Oceanography
Abstract

In the present study a third-generation numerical wave model is used to study effects of a straight Gulf Stream ring on ocean waves in swell and storm conditions. The model accounts for all relevant processes of propagation, generation, and dissipation of the waves (including current effects) without imposing a priori restraints on the spectral development of the waves. The dominating mechanism affecting the waves appears to be current-induced refraction even though the short-crestedness of the incoming waves tends to mask its effects (also in swell conditions). Depending on wind and wave conditions, refraction may trap locally generated waves in the straight Gulf Stream or it may reflect wave energy back to the open ocean. In the Gulf Stream ring, refraction induces a considerable variation in significant wave height and short-crestedness, but it hardly affects the mean wave direction. In storm conditions the processes of generation and dissipation are considerably enhanced in countercurrent situations and reduced following-current situations.

Published
1991

2. High-level NOAA unified modeling overview

Author

Link, Jason S., Tolman, H. L. (Hendrik Lieuwe), Bayler, Eric, Holt, Christina, Brown, Christopher W., Burke, Patrick B., Carman, Jessie C., Cross, Scott, Dunne, John P., Lipton, Douglas W., Mariotti, Annarita, Methot, Richard Donald, Myers, Edward P., Schneider, Timothy L., Grasso, Monica, and Robinson, Katelyn

Published
2017
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4. NOAA holistic climate and earth system model strategy. Phase I, Current state

Author

DeWitt, David G., Gross, Brian D, Higgins, R. Wayne, Kopacz, Monika, Kumar, Arun, Mariotti, Annarita, Saha, Suranjana, and Tolman, H. L. (Hendrik Lieuwe)

Subjects
Climatic changes--Research--United States, Climatic changes--North America--Forecasting--Mathematical models
Abstract

This report describes Phase I of a two-phase study proposed and organized by the NOAA Climate Program Office (CPO) in early 2014 for the development of a NOAA Holistic Climate and Earth System Modeling Strategy. Defining NOAA’s strategy for global climate and earth system modeling for research and operations allows NOAA’s investments in this area to be optimally targeted and leveraged, facilitates linkages with broader environmental modeling efforts within NOAA and outside of NOAA, and enhances NOAA’s participation in the interagency Earth System Prediction Capability initiative. A strategy also helps to identify gaps and opportunities to advance NOAA’s global climate and earth system models and identify resources and synergies needed to maximize the return on those investments. In addition, the 2012 National Research Council report on “A National Strategy for Advancing Climate Modeling” prompts a careful reconsideration of NOAA’s strategy in this area. Phase I defines the current state of, and plans for, NOAA’s global climate and earth system models, developed at the Geophysical Fluid Dynamics Laboratory, the Earth System Research Laboratory, and the National Centers for Environmental Prediction Environmental Modeling Center. This report lays the necessary groundwork for the planned second phase of the CPO proposed study whose ultimate goal is to present potential future model development pathways contributing to the definition of a holistic strategy to advance NOAA global climate and earth system models for research and operations.

Published
2015
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5. Sea state bias in altimeter sea level estimates determined by combining wave model and satellite data

Author

Tran, N., Vandemark, D., Labroue, S., Feng, H., Chapron, Bertrand, Tolman, H. L., Lambin, J., Picot, N., Tran, N., Vandemark, D., Labroue, S., Feng, H., Chapron, Bertrand, Tolman, H. L., Lambin, J., and Picot, N.

Abstract

This study documents a method for increasing the precision of satellite-derived sea level measurements. Results are achieved using an enhanced three-dimensional (3-D) sea state bias (SSB) correction model derived from both Jason-1 altimeter ocean observations (i.e., sea state and wind) and estimates of mean wave period from a numerical ocean wave model, NOAA's WAVEWATCH III. A multiyear evaluation of Jason-1 data indicates sea surface height variance reduction of 1.26 (+/- 0.2) cm(2) in comparison to the commonly applied two-parameter SSB model. The improvement is similar for two separate variance reduction metrics and for separate annual data sets spanning 2002-2004. Spatial evaluation of improvement shows skill increase at all latitudes. Results indicate the new model can reduce the total Jason-1 and Jason-2 altimeter range error budgets by similar to 7.5%. In addition to the 2-D (two-dimensional) and 3-D model differences in correcting the range for wavefield variability, mean model regional differences also occur across the globe and indicate a possible 1-2 cm gradient across ocean basins linked to the zonal variation in wave period (short fetch and period in the west, swells and long period in the east). Overall success of this model provides first evidence that operational wave modeling can support improved ocean altimetry. Future efforts will attempt to work within the limits of wave modeling capabilities to maximize their benefit to Jason-1 and Jason-2 SSB correction methods.

Published
2010
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6. Wave modelling - the state of the art

Author

Cavaleri, L, Alves, J.-H. G. M., Ardhuin, F., Babanin, A., Banner, M., Belibassakis, K., Benoit, M., Donelan, M., Groenweg, J, Herbers, T. H. C., Hwang, P., Janssen, P. A. E. M., Janssen, T., Lavrenov, I. V., Magne, R., Monbaliu, J., Onorato, M., Polnikov, V., Resion, D, Rogers, W. E., Sheremet, A., McKee Smith, J., Tolman, H. L., Van Vledder, G., Wolf, Judith, Young, I, Cavaleri, L, Alves, J.-H. G. M., Ardhuin, F., Babanin, A., Banner, M., Belibassakis, K., Benoit, M., Donelan, M., Groenweg, J, Herbers, T. H. C., Hwang, P., Janssen, P. A. E. M., Janssen, T., Lavrenov, I. V., Magne, R., Monbaliu, J., Onorato, M., Polnikov, V., Resion, D, Rogers, W. E., Sheremet, A., McKee Smith, J., Tolman, H. L., Van Vledder, G., Wolf, Judith, and Young, I

Abstract

This paper is the product of the wave modelling community and it tries to make a picture of the present situation in this branch of science, exploring the previous and the most recent results and looking ahead towards the solution of the problems we presently face. Both theory and applications are considered. The many faces of the subject imply separate discussions. This is reflected into the single sections, seven of them, each dealing with a specific topic, the whole providing a broad and solid overview of the present state of the art. After an introduction framing the problem and the approach we followed, we deal in sequence with the following subjects: (Section) 2, generation by wind; 3, nonlinear interactions in deep water; 4, white-capping dissipation; 5, nonlinear interactions in shallow water; 6, dissipation at the sea bottom; 7, wave propagation; 8, numerics. The two final sections, 9 and 10, summarize the present situation from a general point of view and try to look at the future developments.

Published
2007

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