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The North Pacific High and wintertime pre‐conditioning of California current productivity
Author(s) -
Schroeder Isaac D.,
Black Bryan A.,
Sydeman William J.,
Bograd Steven J.,
Hazen Elliott L.,
Santora Jarrod A.,
Wells Brian K.
Publication year - 2013
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/grl.50100
Subject(s) - upwelling , environmental science , productivity , ecosystem , oceanography , climatology , forcing (mathematics) , current (fluid) , marine ecosystem , atmospheric sciences , ecology , geology , biology , economics , macroeconomics
Variations in large‐scale atmospheric forcing influence upwelling dynamics and ecosystem productivity in the California Current System (CCS). In this paper, we characterize interannual variability of the North Pacific High over 40 years and investigate how variation in its amplitude and position affect upwelling and biology. We develop a winter upwelling “pre‐conditioning” index and demonstrate its utility to understanding biological processes. Variation in the winter NPH can be well described by its areal extent and maximum pressure, which in turn is predictive of winter upwelling. Our winter pre‐conditioning index explained 64% of the variation in biological responses (fish and seabirds). Understanding characteristics of the NPH in winter is therefore critical to predicting biological responses in the CCS.