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Time dependence in atmospheric carbon inputs from drainage of organic soils
Author(s) -
Rojstaczer Stuart,
Deverel Steven J.
Publication year - 1993
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 - 10.1029/93gl01339
Subject(s) - san joaquin , subsidence , soil water , delta , environmental science , drainage , current (fluid) , total organic carbon , hydrology (agriculture) , carbon fibers , atmosphere (unit) , flux (metallurgy) , atmospheric sciences , physical geography , geology , soil science , oceanography , geomorphology , environmental chemistry , meteorology , geography , aerospace engineering , ecology , chemistry , engineering , materials science , structural basin , composite number , composite material , biology , metallurgy , geotechnical engineering
Historical and contemporary subsidence in the San Joaquin‐Sacramento Delta, California indicates that subsidence rates associated with drainage of organic soils have declined over time. Contemporary measurements of carbon flux into the atmosphere can be used to predict contemporary rates of permanent subsidence. This correspondence indicates that most subsidence is caused by carbon oxidation. The current contribution of atmospheric carbon from the Delta is 2×10 12 gm C/yr. This estimate is a factor of 3–4 less than previous estimates and reflects the declining rate of CO 2 production in the Delta over the last several decades. Estimates of current production of CO 2 from other drained agricultural lands that are based upon time‐averaged historical rates of subsidence are also likely to be too large.
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