Effects of future climate change on regional air pollution episodes in the United States

Geophysical Research Letters - Tập 31 Số 24 - 2004
Loretta J. Mickley1, Daniel J. Jacob1, Brendan D. Field1, David Rind2
1Division of Engineering and Applied Science Harvard University Cambridge Massachusetts USA
2Goddard Institute for Space Studies New York New York USA

Tóm tắt

We examine the impact of future climate change on regional air pollution meteorology in the United States by conducting a transient climate change (1950–2052) simulation in a general circulation model (GCM) of the Goddard Institute of Space Studies (GISS). We include in the GCM two tracers of anthropogenic pollution, combustion carbon monoxide (COt) and black carbon (BCt). Sources of both tracers and the loss frequency of COt are held constant in time, while wet deposition of BCt responds to the changing climate. Results show that the severity and duration of summertime regional pollution episodes in the midwestern and northeastern United States increase significantly relative to present. Pollutant concentrations during these episodes increase by 5–10% and the mean episode duration increases from 2 to 3–4 days. These increases appear to be driven by a decline in the frequency of mid‐latitude cyclones tracking across southern Canada. The cold fronts associated with these cyclones are known to provide the main mechanism for ventilation of the midwestern and northeastern United States. Mid‐latitude cyclone frequency is expected to decrease in a warmer climate; such a decrease is already apparent in long‐term observations. Mixing depths over the midwest and northeast increase by 100–240 m in our future‐climate simulation, not enough to compensate for the increased stagnation resulting from reduced cyclone frequency.

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Tài liệu tham khảo

10.1175/1520-0442(1991)004<0263:TICAAF>2.0.CO;2

10.1029/2002JD002688

Bufalini J. J., 1989, The Potential Effects of Global Climate Change on the United States, 195

10.1007/s003820050229

10.1029/2000JD900574

10.1029/95JD00073

10.1016/0960-1686(93)90035-W

10.1175/1520-0442(2003)16<2262:PCOECA>2.0.CO;2

10.1029/JD093iD08p09341

10.1029/2001JD001143

10.1016/j.atmosenv.2004.02.033

10.1175/1520-0442(2001)014<4398:SCIATC>2.0.CO;2

J. T. Houghton Y. Ding D. J. Griggs M. Noguer P. J. van der Linden X. Dai K. Maskell C. A. Johnson 2001 Cambridge Univ. Press New York

10.1029/93JD01223

10.1029/98JD01224

10.1029/1999JD900204

10.1029/1999GL900367

10.1029/1999JD900248

10.1016/S1352-2310(01)00152-2

10.1029/JD094iD06p08511

10.1175/1520-0442(2001)014<2763:TINHSC>2.0.CO;2

10.1029/96JD00097

10.1029/1999JD900439

10.1029/2003JD003653

10.1029/98JD00526

10.1029/2002JD003190

10.1016/S1352-2310(99)00266-6

10.1029/96JD00551

10.1029/1999JD900006

10.1029/2001JD000439

10.1016/S1352-2310(00)00370-8

10.1029/2000JD900704

10.1029/94JD02146

10.1029/2000JD900570

10.1016/1352-2310(95)00146-P

10.1080/10473289.2002.10470806

10.1029/98JD00158

10.1016/S1352-2310(98)00203-9

10.1175/1520-0442(1997)010<1616:MSNWCA>2.0.CO;2

10.1175/1520-0493(1980)108<0387:TCOCAA>2.0.CO;2

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Geophysical Research Letters

Tập 31 Số 24

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