Trends of Air Temperature, Precipitation and Potential Evapotranspiration in Southeastern United States and East-central China

Trends of Air Temperature, Precipitation and Potential Evapotranspiration in Southeastern United States and East-central China

Bibliographic Details
Main Author: Zhao, Yiming
Language:English
Published: The Ohio State University / OhioLINK 2015
Subjects:
Environmental Science
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=osu1429880709
id ndltd-OhioLink-oai-etd.ohiolink.edu-osu1429880709
record_format oai_dc
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language English
sources NDLTD
topic Environmental Science
spellingShingle Environmental Science
Zhao, Yiming
Trends of Air Temperature, Precipitation and Potential Evapotranspiration in Southeastern United States and East-central China
author Zhao, Yiming
author_facet Zhao, Yiming
author_sort Zhao, Yiming
title Trends of Air Temperature, Precipitation and Potential Evapotranspiration in Southeastern United States and East-central China
title_short Trends of Air Temperature, Precipitation and Potential Evapotranspiration in Southeastern United States and East-central China
title_full Trends of Air Temperature, Precipitation and Potential Evapotranspiration in Southeastern United States and East-central China
title_fullStr Trends of Air Temperature, Precipitation and Potential Evapotranspiration in Southeastern United States and East-central China
title_full_unstemmed Trends of Air Temperature, Precipitation and Potential Evapotranspiration in Southeastern United States and East-central China
title_sort trends of air temperature, precipitation and potential evapotranspiration in southeastern united states and east-central china
publisher The Ohio State University / OhioLINK
publishDate 2015
url http://rave.ohiolink.edu/etdc/view?acc_num=osu1429880709
work_keys_str_mv AT zhaoyiming trendsofairtemperatureprecipitationandpotentialevapotranspirationinsoutheasternunitedstatesandeastcentralchina
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-osu14298807092021-08-03T06:30:45Z Trends of Air Temperature, Precipitation and Potential Evapotranspiration in Southeastern United States and East-central China Zhao, Yiming Environmental Science Human beings are increasing emissions of greenhouse gases, inducing the anthropogenic climate change. Climate change influences the air temperature as well as the hydrological cycle globally. In the background of climate change, previous research indicated different trends of air temperature, precipitation and evapotranspiration in the southeastern United States (SUS) and east-central China (ECC). This study’s objective is to compare the trends of air temperature, precipitation and potential evapotranspiration in the SUS and the ECC, and the impacts of climatic variables on these two regions. The data for analyzing the trends of air temperature, precipitation and potential evapotranspiration are from 6 stations in 3 states (Fairhope 2 NE, AL; Mobile Regional Airport, AL; Montgomery Airport, AL; Alma Bacon Co Airport, GA; Toccoa, GA; Meridian Key Field, MS) in the SUS and 6 stations in 3 provinces (Lushi, Henan; Xinyang, Henan; Anqing, Anhui; Wuhan, Hubei; Yichang, Hubei; Bengbu, Anhui) in the ECC.The results from observed data of these 12 stations indicated that: most of the stations in the SUS did not show significantly decreased trends of air temperature during 1931–2013, while most of the stations in the ECC showed significantly increased trends of air temperature during 1951–2013; no significant trend was found in the SUS during 1931–2013 or in the ECC during 1951–2013. Very few stations in the SUS showed significant potential evapotranspiration trend during 1931–2013 but most of the stations in the ECC showed significantly increased trends of potential evapotranspiration during 1951–2013.To analyze the different impacts of large-scale climatic variables on the air temperature, precipitation and potential evapotranspiration in the SUS and the ECC, 7 climatic variables (North Atlantic Oscillation, Arctic Oscillation, North Pacific Index, Southern Oscillation Index, Atlantic Multidecadal Oscillation, Pacific Decadal Oscillation, Niño 3.4 SST Index) were selected to obtain their correlations in these two regions. No significant cooling trend is found in the weather stations selected in the southeastern United States during 1951–2013. Stepwise multiple linear regression (SMLR) models are employed to reveal the impacts of the large-scale climatic variables on the variance of the monthly air temperature in these two regions. All 7 climatic variables selected for the regression models are linked to more than 75% of the variance in both the SUS and the ECC. In both regions, the North Pacific Index, the Atlantic Multidecadal Oscillation and the Niño3.4 Index explain most of the variance, in which North Pacific Index contributes to the variance most. The predicted annual air temperature in the SUS also shows no significant trend in cooling during 1950–2013, however, in both the SUS and the ECC, a rapidly increasing trend in predicted annual air temperature is significant (0.041 ºC/yr in the SUS and 0.056 ºC/yr in the ECC, with 95% confidence) over the 40 years between 1974 and 2013. Scarcely significant trend of annual total precipitation is observed in the weather stations selected in the SUS and the ECC during 1951–2013. The weather stations selected in the ECC are more likely to have increasing potential evapotranspiration trends than those in the SUS during 1949–2013. SMLR models can’t explain most of the variance of the monthly total precipitation in both regions (1.3% in the SUS and 24.5% in the ECC). Conversely, all 7 climatic variables selected for the regression models are linked to more than 72% of the variance of monthly total potential evapotranspiration in both regions. The North Pacific Index, the Atlantic Multidecadal Oscillation and the Niño3.4 Index explain most of the variance in both regions. The predicted annual total potential evapotranspiration in the SUS during 1950–2014 and ECC during 1951–2014 shows no significant trend, however, a rapidly increasing trend in predicted annual total potential evapotranspiration is significant in both regions (3.975mm/yr in the SUS and 4.312 mm/yr in the ECC, with 95% confidence) during 1974–2013. To minimize the potential threats of increased air temperature and potential evapotranspiration predicted in this research, mitigation and adaptation measurements should be taken to protect the ecology in these two regions, especially the forestry in the SUS and agricultural production in the ECC. 2015-10-20 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1429880709 http://rave.ohiolink.edu/etdc/view?acc_num=osu1429880709 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.

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