Analysis of the Beaufort Gyre Freshwater Content in 2003–2018

Autor: Richard A. Krishfield, William J. Williams, Michiyo Yamamoto-Kawai, Andrey Proshutinsky, Mary-Louise Timmermans, Kyoung-Ho Cho, Dmitry S. Dukhovskoy, Sarah Zimmermann, Shigeto Nishino, Motoyo Itoh, Sung-Ho Kang, Eiji Watanabe, Gennady Platov, Takashi Kikuchi, Jing Zhao, Thomas W. K. Armitage, Kazutaka Tateyama, John M. Toole, Elena Golubeva, Georgy E. Manucharyan
Rok vydání: 2019
Předmět:
Informatics
Beaufort Gyre
010504 meteorology & atmospheric sciences
Biogeosciences
Oceanography
01 natural sciences
Oceans
Arctic Ocean
Earth and Planetary Sciences (miscellaneous)
Research Articles
freshwater balance
geography.geographical_feature_category
Climate and Interannual Variability
6. Clean water
Oceanography: General
climate change
Geophysics
Anticyclone
Atmospheric Processes
circulation
Oceanography: Physical
Research Article
Climate change
Descriptive and Regional Oceanography
Decadal Ocean Variability
Geochemistry and Petrology
Climate Dynamics
Sea ice
The Arctic: An AGU Joint Special Collection
Global Change
14. Life underwater
Numerical Modeling
Arctic Region
Numerical Solutions
0105 earth and related environmental sciences
Climate Change and Variability
geography
Discharge
Climate Variability
Modeling
Arctic and Antarctic oceanography
Fresh water
13. Climate action
Space and Planetary Science
Antarctica
Environmental science
Satellite
Computational Geophysics
Geographic Location
Hydrography
Zdroj: Journal of Geophysical Research. Oceans
ISSN: 2169-9291
2169-9275
DOI: 10.1029/2019jc015281
Popis: Hydrographic data collected from research cruises, bottom‐anchored moorings, drifting Ice‐Tethered Profilers, and satellite altimetry in the Beaufort Gyre region of the Arctic Ocean document an increase of more than 6,400 km3 of liquid freshwater content from 2003 to 2018: a 40% growth relative to the climatology of the 1970s. This fresh water accumulation is shown to result from persistent anticyclonic atmospheric wind forcing (1997–2018) accompanied by sea ice melt, a wind‐forced redirection of Mackenzie River discharge from predominantly eastward to westward flow, and a contribution of low salinity waters of Pacific Ocean origin via Bering Strait. Despite significant uncertainties in the different observations, this study has demonstrated the synergistic value of having multiple diverse datasets to obtain a more comprehensive understanding of Beaufort Gyre freshwater content variability. For example, Beaufort Gyre Observational System (BGOS) surveys clearly show the interannual increase in freshwater content, but without satellite or Ice‐Tethered Profiler measurements, it is not possible to resolve the seasonal cycle of freshwater content, which in fact is larger than the year‐to‐year variability, or the more subtle interannual variations.
Key Points Beaufort Gyre freshwater content time series (2003–2018) from different data sets are updated, compared, and analyzedQualitative and quantitative estimates of factors and mechanisms driving freshwater content changes are providedIn 2003–2018, the major sources of accumulated fresh water were sea ice melt, Mackenzie River runoff, and Bering Strait transport
Databáze: OpenAIRE
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