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Your search keyword '"JONES, BRENT D."' showing total 19 results
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3. Accurate pH and O2 Measurements from Spray Underwater Gliders

Author

Takeshita, Yuichiro, primary, Jones, Brent D., additional, Johnson, Kenneth S., additional, Chavez, Francisco P., additional, Rudnick, Daniel L., additional, Blum, Marguerite, additional, Conner, Kyle, additional, Jensen, Scott, additional, Long, Jacqueline S., additional, Maughan, Thom, additional, Mertz, Keaton L., additional, Sherman, Jeffrey T., additional, and Warren, Joseph K., additional

Published
2021
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7. Accurate pH and O2 Measurements from Spray Underwater Gliders.

Author

YUICHIRO TAKESHITA, JONES, BRENT D., JOHNSON, KENNETH S., CHAVEZ, FRANCISCO P., RUDNICK, DANIEL L., BLUM, MARGUERITE, CONNER, KYLE, JENSEN, SCOTT, LONG, JACQUELINE S., MAUGHAN, THOM, MERTZ, KEATON L., SHERMAN, JEFFREY T., and WARREN, JOSEPH K.

Subjects
*UNDERWATER gliders, *OCEAN acidification, *PARTIAL pressure, *ARAGONITE, *SYSTEMS theory, *SPANNING trees
Abstract

The California Current System is thought to be particularly vulnerable to ocean acidification, yet pH remains chronically undersampled along this coast, limiting our ability to assess the impacts of ocean acidification. To address this observational gap, we integrated the Deep-Sea-DuraFET, a solid-state pH sensor, onto a Spray underwater glider. Over the course of a year starting in April 2019, we conducted seven missions in central California that spanned 161 glider days and >1600 dives to a maximum depth of 1000 m. The sensor accuracy was estimated to be ± 0.01 based on comparisons to discrete samples taken alongside the glider (n = 105), and the precision was ± 0.0016. CO2 partial pressure, dissolved inorganic carbon, and aragonite saturation state could be estimated from the pH data with uncertainty better than ± 2.5%, ± 8 μmol kg-1, and ± 2%, respectively. The sensor was stable to ± 0.01 for the first 9 months but exhibited a drift of 0.015 during the last mission. The drift was correctable using a piecewise linear regression based on a reference pH field at 450 m estimated from published global empirical algorithms. These algorithms require accurate O2 as inputs; thus, protocols for a simple predeployment air calibration that achieved accuracy of better than 1% were implemented. The glider observations revealed upwelling of undersaturated waters with respect to aragonite to within 5 m below the surface near Monterey Bay. These observations highlight the importance of persistent observations through autonomous platforms in highly dynamic coastal environments. [ABSTRACT FROM AUTHOR]

Published
2021
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17. Hepatic Biopsy

Author

Jones, Brent D., Hitt, Mark, and Hurst, Thomas

Abstract

The evaluation and management of liver disease can be facilitated by the use of hepatic biopsy. This article discusses indications for biopsy, biopsy techniques, and pre- and postbiopsy considerations.

Published
1985
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19. Medical update: Initial assessment of patients with acute vomiting and/or diarrhea.

Author

Jones, Brent D.

Subjects
VETERINARY therapeutics, DIARRHEA in animals
Abstract

Considers the initial assessment of animal patients that present with vomiting and/or diarrhea. Understanding the vomiting process; Nausea in dogs and cats; Retching stage in patients; Active vomiting; Importance of thorough history for the proper management of acute vomiting patient; Chronological guide for obtaining a history.

Published
1995

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