Open AccessShort‐term effects of agriculture on air pollution and climate in California
Author(s) -
Jacobson Mark Z.
Publication year - 2008
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2008jd010689
Subject(s) - environmental science , irrigation , albedo (alchemy) , precipitation , agriculture , hydrology (agriculture) , atmospheric sciences , relative humidity , cloud albedo , meteorology , geography , cloud cover , agronomy , geology , cloud computing , art , operating system , geotechnical engineering , archaeology , performance art , computer science , biology , art history
This paper discusses the short‐term effects of irrigation and albedo differences due to agriculture on California and Los Angeles air pollution and climate. High‐resolution irrigation, land use, soil, albedo, and emission data were applied at the subgrid scale in the nested global‐through‐urban GATOR‐GCMOM model to examine these issues following a comparison of baseline model results with data. In August, irrigation alone was found to increase soil moisture, thereby increasing nighttime but decreasing daytime ground temperatures more, causing a net ground cooling in California and Los Angeles. Agriculture was calculated to increase the albedo of the northern Central Valley but decrease that of the southern valley more relative to nonagricultural land today, offsetting part of the cooling due to irrigation alone. The spatial maximum day‐night average August cooling in the Central Valley due to irrigation plus albedo differences from agriculture was 0.9 K at 30 m height and 2.3 K at the ground, in range of an historic 0.74–2.4 K cooling at 2 m attributed to heavily irrigated agriculture in an independent data study. When averaged over all model cells containing >0% irrigation, irrigation alone and irrigation plus albedo differences decreased day‐night average 2‐m temperatures by 0.44 K and 0.16 K, respectively, indicating greater local than regional effects of agriculture. In the Central Valley, irrigation increased the relative humidity, cloud water, and precipitation, shifting aerosol and soluble gas mass to clouds and rain. In the valley and Los Angeles, agriculture stabilized air, decreasing wind speeds and turbulence, increasing pollution in the absence of rain. Thus, when enhancing clouds and precipitation, agriculture decreased pollution; otherwise, agriculture increased pollution. Agriculture in parts of the polluted eastern Los Angeles basin increased fine particulate matter by ∼2% and ozone by ∼0.1%. All results were robust to a change in the simulation date, although further evaluation is needed to better quantify effects of agriculture on climate and air quality.