Asymmetry in the Seasonal Cycle of Zonal‐Mean Surface Air Temperature

Asymmetry in the Seasonal Cycle of Zonal‐Mean Surface Air Temperature
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纬向平均表面气温季节循环的不对称性

DOI:
10.1029/2023gl103403
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发表时间:
2023
影响因子:
5.2
通讯作者:
Donohoe, Aaron
Donohoe, Aaron
中科院分区:
地球科学1区
文献类型:
--
作者:
Roach, Lettie A.;Eisenman, Ian;Wagner, Till J. W.;Donohoe, Aaron

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在大多数纬度,纬向平均地表气温的季节周期明显不对称:暖季的长度不等于冷季的长度。这种不对称性在空间上存在差异,副热带的降温季节比增温季节短~ 40天,两极的增温季节比降温季节短~ 100天。此外,北半球和南半球的不对称性也不同。在这里,我们展示了这些观测到的特征在一个简单的模型中被广泛捕获,该模型是由实际日照强迫的温度演变。该模型表明,地球轨道的离心率在很大程度上决定了半球对比,而倾角大致决定了子午线结构。云、大气热通量辐合和时不变有效地表热容对季节不对称性的影响最小。这种简单的一阶图像在以前关于地表温度季节循环的讨论中是不存在的。
At most latitudes, the seasonal cycle of zonal‐mean surface air temperature is notably asymmetric: the length of the warming season is not equal to the length of the cooling season. The asymmetry varies spatially, with the cooling season being ∼40 days shorter than the warming season in the subtropics and the warming season being ∼100 days shorter than the cooling season at the poles. Furthermore, the asymmetry differs between the Northern Hemisphere and the Southern Hemisphere. Here, we show that these observed features are broadly captured in a simple model for the evolution of temperature forced by realistic insolation. The model suggests that Earth's orbital eccentricity largely determines the hemispheric contrast, and obliquity broadly dictates the meridional structure. Clouds, atmospheric heat flux convergence, and time‐invariant effective surface heat capacity have minimal impacts on seasonal asymmetry. This simple, first‐order picture has been absent from previous discussions of the surface temperature seasonal cycle.
DOI: 10.1073/pnas.1809868115
发表时间: 2018-10-09
影响因子: 11.1
作者:
Koll, Daniel D. B.;Cronin, Timothy W.
通讯作者: Cronin, Timothy W.
DOI: 10.1175/jcli-d-19-0329.1
发表时间: 2020-05-01
期刊: JOURNAL OF CLIMATE
影响因子: 4.9
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DOI: --
发表时间: 2018
影响因子: --
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DOI: 10.1175/jcli-d-12-00713.1
发表时间: 2013-07-01
期刊: JOURNAL OF CLIMATE
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