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oai:www.ideals.illinois.edu:2142/42448 2023-07-11 col_2142_14839 col_2142_5131 com_2142_14838 com_2142_13459 com_2142_8903 com_2142_5130

Baidya Roy, Somnath Rastogi, Deeksha 2013-02-03T19:45:58Z 2013-02-03T19:45:58Z 2015-02-03T11:00:31Z 2012-12 2013-02-03T19:45:58Z 2012-12 This study investigates cropland-atmosphere feedbacks in the Midwestern United States. Growing crops impact local climate during the growing season by influencing heat, moisture and momentum exchange between the land and the atmosphere. These changes in turn affect the crop growth, thus completing a feedback loop. A computationally efficient modeling tool has been specifically developed to study these feedbacks. A vegetation module derived from a crop growth model SUCROS has been incorporated in the Weather Research Forecasting (WRF) model. This coupled model has the capability to explore cropland-atmosphere feedbacks at a high spatial resolution at mesoscale. Results from soybean fields in Nebraska and Illinois show that the crop growth depends directly on temperature, incoming shortwave radiation and precipitation. As the crops grow, they affect energy partitioning between sensible and latent heat leading to a change in the cloud cover and consequently changing incoming shortwave radiation, air temperature and precipitation. An increase in cloud cover reduces incoming shortwave radiation and hence photosynthesis, exerting a negative feedback. However, an increase in precipitation reduces water stress and promotes growth, resulting in a positive feedback. The net impact on crop growth is a nonlinear combination of these feedbacks. Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2012-12-01T17:11:21Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Rastogi_Deeksha.docx: 7815489 bytes, checksum: d2785d15c37bf25b7aadf84904e5d7cf (MD5) Rastogi_Deeksha.pdf: 7798911 bytes, checksum: 181440c8584a6a7d9c13a00121bf8b0a (MD5) Made available in DSpace on 2013-02-03T19:45:58Z (GMT). No. of bitstreams: 3 Deeksha_Rastogi.pdf: 7799436 bytes, checksum: abacff3b4ffed0bbbd192c7cf3e223e3 (MD5) Rastogi_Deeksha.docx: 7815489 bytes, checksum: d2785d15c37bf25b7aadf84904e5d7cf (MD5) license.txt: 4065 bytes, checksum: bb98bec824327f630b62a86729e0bb55 (MD5) Restriction data tranferred 2014-07-01T11:35:59-05:00 Original Data Group with Access Administrator Release Date: 2015-02-03 13:47:48 UTC Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system Item marked as restricted to the 'Administrator' Group (id=1) by Seth Robbins (srobbins@illinois.edu) on 2013-02-03T19:47:54Z Item is restricted until 2015-02-03T19:47:48Z Limited Restriction Lifted for Item 42396 on 2015-02-03T11:00:31Z. http://hdl.handle.net/2142/42448 en Copyright 2012 Deeksha Rastogi cropland-atmosphere feedbacks feedback loop negative feedback positive feedback A numerical study of cropland-atmosphere feedbacks by incorporating a crop growth module in the WRF model text Atmospheric Sciences 1253 Atmospheric Sciences 0334 University of Illinois at Urbana-Champaign Thesis M.S. MS:Atmospheric Sciences -UIUC 10KS0334MS