2015
DOI: 10.1002/2015jd023748
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Atmospheric responses to idealized urban land surface forcing in eastern China during the boreal spring

Abstract: In contrast to the impacts of anthropogenic aerosols and greenhouse gases, little is known about the impact of urban land surface forcing (ULSF) on large‐scale atmospheric circulation. This study explores atmospheric responses to idealized ULSF in eastern China during the boreal spring using the Community Atmosphere Model version 5.1 coupled with the Community Land Model version 4. Results show that the ULSF leads to an increased air temperature in northern China both near the surface and in the lower troposph… Show more

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Cited by 5 publications
(11 citation statements)
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“…Although the low‐level monsoonal flow is reasonably reproduced, precipitation over the southern TP (eastern China) is still overestimated (underestimated) in the model (Figures d and e). However, these systematic model biases are common in other climate models [ Sperber et al ., ; Su et al ., ] and in the models we used previously [ Deng and Xu , , ]. Overall, the model exhibits a reasonable performance in simulating the Asian summer monsoon and gives us confidence for further sensitivity analysis.…”
Section: Data Model and Methodsmentioning
confidence: 99%
“…Although the low‐level monsoonal flow is reasonably reproduced, precipitation over the southern TP (eastern China) is still overestimated (underestimated) in the model (Figures d and e). However, these systematic model biases are common in other climate models [ Sperber et al ., ; Su et al ., ] and in the models we used previously [ Deng and Xu , , ]. Overall, the model exhibits a reasonable performance in simulating the Asian summer monsoon and gives us confidence for further sensitivity analysis.…”
Section: Data Model and Methodsmentioning
confidence: 99%
“…The relationship between urban land expansion and exporting efficiency is also impacted by the urbanization‐induced changes in zonal winds, especially during July. As indicated in Deng and Xu [], during boreal springs, the change in zonal winds is closely linked to urbanization‐induced changes in the atmospheric thermal structure, which follows the thermal wind equation UT=RflnP0P1trueT¯yP where R is the gas constant for dry air, f is the Coriolis parameter, P 0 and P 1 are two referenced pressure layers, and the zonal thermal wind ( U T ) is negatively correlated with the mean meridional temperature gradient (MTG, T¯/yP) between these two constant pressure layers. Similar linkage is also found for each month in this work, and there is an opposite perturbation in zonal winds for adjacent latitude ranges (Figure S17 in supporting information).…”
Section: Impacts Of Urban Land Expansion On the Exporting Efficiency mentioning
confidence: 99%
“…We focus on the scenarios of URB5 and URB20 during April and July for the detailed analysis (Figure ). During April, in the URB5 scenario, the air becomes cooler in the middle upper troposphere over middle latitudes after urbanization, alike the findings in Deng and Xu []. The initial surface warming induced by external forcings would trigger rather complicated chains of thermal feedback in the large‐scale atmospheric dynamic system [e.g., Kelly and Mapes , ].…”
Section: Impacts Of Urban Land Expansion On the Exporting Efficiency mentioning
confidence: 99%
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“…However, enhanced prevailing southwesterly wind over southern China induced by urban cover forcing alone is no longer present in this case, and only westerly wind anomalies occur in the main urban areas, implying that urban‐forced responses would be overwhelmed by the nonlinear contribution when anthropogenic aerosol forcing is prescribed. Once again, these responses to urban land surface forcing qualitatively resemble the urban‐forced spring climate changes obtained using the same AGCM [ Deng and Xu , ].…”
Section: Individual Forcing Effect With the Presence Of Nonlinear Effectmentioning
confidence: 99%