Trends in U.S. Surface Humidity, 1930–2010

Journal of Applied Meteorology and Climatology - Tập 52 Số 1 - Trang 147-163 - 2013
P. Brown1, Arthur T. DeGaetano1
1Northeast Regional Climate Center, Department of Earth and Atmospheric Science, Cornell University, Ithaca, New York

Tóm tắt

AbstractU.S. hourly surface observations are examined at 145 stations to identify annual and seasonal changes in temperature, dewpoint, relative humidity, and specific humidity since 1930. Because of numerous systematic instrument changes that have occurred, a homogeneity assessment was performed on temperatures and dewpoints. Dewpoints contained higher breakpoint detection rates associated with instrumentation changes than did temperatures. Temperature trends were tempered by adjusting the data, whereas dewpoints were unaffected. The effects were the same whether the adjustments were based on statistically detected or fixed-year breakpoints. Average long-term trends (1930–2010) indicate that temperature has warmed but that little change has occurred in dewpoint and specific humidity. Warming is strongest in spring. There is evidence of inhomogeneity in the relative humidity record that primarily affects data from prior to 1950. Therefore, long-term decreases in relative humidity, which are strongest in winter, need to be viewed with caution. Trends since 1947 indicate that the warming of temperatures has coincided with increases in dewpoints and a moistening of specific humidity. This moistening is especially pronounced during the summer in the Midwest. For the nation, trends in relative humidity show little change for the period 1947–2010, during which these data are more homogeneous. Moistening has occurred throughout the central United States while other regions have experienced drying. Urban-related warming and drying trends are present in the data, but their effect is minimal. Regional changes in land use and moisture availability are likely influencing trends in atmospheric moisture.

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Tài liệu tham khảo

Balling, 1986, Temporal analysis of summertime weather stress levels in Phoenix, Arizona, Arch. Meteor. Geophys. Bioklimatol., 36, 331, 10.1007/BF02263137

Bolton, 1980, Computation of equivalent potential temperature, Mon. Wea. Rev., 108, 1046, 10.1175/1520-0493(1980)108<1046:TCOEPT>2.0.CO;2

Boucher, 2004, Direct human influence of irrigation on atmospheric water vapour and climate, Climate Dyn., 22, 597, 10.1007/s00382-004-0402-4

Brown, 2009, A method to detect inhomogeneities in historical dewpoint temperature series, J. Appl. Meteor. Climatol., 48, 2362, 10.1175/2009JAMC2123.1

Brown, 2010, Using a discriminant analysis to classify urban and rural climate stations based on diurnal range of temperature and dewpoint depression, J. Appl. Meteor. Climatol., 49, 2366, 10.1175/2010JAMC2458.1

Changnon, 2006, Midwestern high dew point events 1960-2000, Phys. Geogr., 27, 494, 10.2747/0272-3646.27.6.494

Compo, 2011, The Twentieth Century Reanalysis Project, Quart. J. Roy. Meteor. Soc., 137, 1, 10.1002/qj.776

Dai, 2006, Recent climatology, variability, and trends in global surface humidity, J. Climate, 19, 3589, 10.1175/JCLI3816.1

Diffenbaugh, 2009, Influence of modern land cover on the climate of the United States, Climate Dyn., 33, 945, 10.1007/s00382-009-0566-z

Elliott, 1995, On detecting long-term changes in atmospheric moisture, Climatic Change, 31, 349, 10.1007/BF01095152

Gaffen, 1999, Climatology and trends in U.S. surface humidity and temperature, J. Climate, 12, 811, 10.1175/1520-0442(1999)012<0811:CATOUS>2.0.CO;2

Kent, 1993, The accuracy of voluntary observing ships’ meteorological observations—Results of the VSOP-NA, J. Atmos. Oceanic Technol., 10, 591, 10.1175/1520-0426(1993)010<0591:TAOVOS>2.0.CO;2

Lin, 2004

Lin, 2004, Sensor and electronic biases/errors in air temperature measurements in common weather station networks, J. Atmos. Oceanic Technol., 21, 1025, 10.1175/1520-0426(2004)021<1025:SAEEIA>2.0.CO;2

Lin, 2008, What are daily maximum and minimum temperatures in observed climatology?, Int. J. Climatol., 28, 283, 10.1002/joc.1536

Lu, 2010, Spatial variabilities and their relationships of the trends of temperature, water vapor, and precipitation in the North American Regional Reanalysis, J. Geophys. Res., 115

Lu, 2005, An update of U.S. temperature trends, J. Climate, 18, 4906, 10.1175/JCLI3557.1

Mahmood, 2004, Modification of growing-season surface temperature records in the northern Great Plains due to land use transformation: Verification of modeling results and implications for global climate change, Int. J. Climatol., 24, 311, 10.1002/joc.992

Mahmood, 2008, Increase in near-surface atmospheric moisture content due to land use changes: Evidence from the observed dewpoint temperature data, Mon. Wea. Rev., 136, 1554, 10.1175/2007MWR2040.1

Menne, 2005, Detection of undocumented changepoints using multiple test statistics and composite reference series, J. Climate, 18, 4271, 10.1175/JCLI3524.1

Menne, 2009, Homogenization of temperature series via pairwise comparisons, J. Climate, 22, 1700, 10.1175/2008JCLI2263.1

Min, 2008, Human induced Arctic moistening, Science, 320, 518, 10.1126/science.1153468

Ratner, 1962, Climatological effect of changeover to hygrothermometer, Mon. Wea. Rev., 90, 89, 10.1175/1520-0493(1962)090<0089:CEOCTH>2.0.CO;2

Robinson, 1998, Monthly variations of dew point temperature in the conterminous United States, Int. J. Climatol., 18, 1539, 10.1002/(SICI)1097-0088(19981130)18:14<1539::AID-JOC326>3.0.CO;2-L

Robinson, 2000, Temporal trends in United States dew point temperatures, Int. J. Climatol., 20, 985, 10.1002/1097-0088(200007)20:9<985::AID-JOC513>3.0.CO;2-W

Sandstrom, 2004, A central U.S. summer extreme dew-point climatology (1949–2000), Phys. Geogr., 25, 191, 10.2747/0272-3646.25.3.191

Santer, 2007, Identification of human-induced changes in atmospheric moisture content, Proc. Natl. Acad. Sci. USA, 104, 15 248, 10.1073/pnas.0702872104

Schwartzman, 1998, Observed changes in the diurnal dewpoint cycles across North America, Geophys. Res. Lett., 25, 2265, 10.1029/98GL01843

Simmons, 2010, Low-frequency variations in surface atmospheric humidity, temperature, and precipitation: Inferences from reanalyses and monthly gridded observational data sets, J. Geophys. Res., 115, 10.1029/2009JD012442

Smith, 2011, The integrated surface database: Recent developments and partnerships, Bull. Amer. Meteor. Soc., 92, 704, 10.1175/2011BAMS3015.1

Trenberth, 2007

Vincent, 1998, A technique for the identification of inhomogeneities in Canadian temperature series, J. Climate, 11, 1094, 10.1175/1520-0442(1998)011<1094:ATFTIO>2.0.CO;2

Vincent, 2007, Surface temperature and humidity trends in Canada for 1953–2005, J. Climate, 20, 5100, 10.1175/JCLI4293.1

Wang, 2001, Changes in extreme wave heights in Northern Hemisphere oceans and related atmospheric circulation regimes, J. Climate, 14, 2204, 10.1175/1520-0442(2001)014<2204:COEWHI>2.0.CO;2

Willett, 2007

Willett, 2007, Attribution of observed surface humidity changes to human influence, Nature, 449, 710, 10.1038/nature06207

Willett, 2008, Recent changes in surface humidity: Development of the HadCRUH dataset, J. Climate, 21, 5364, 10.1175/2008JCLI2274.1

Zhang, 2000, Temperature and precipitation trends in Canada during the 20th century, Atmos.–Ocean, 38, 395, 10.1080/07055900.2000.9649654

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Journal of Applied Meteorology and Climatology

Tập 52 Số 1

147-163

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