Diagnosing the column-integrated moist static energy budget associated with the northward-propagating boreal summer intraseasonal oscillation
Diagnosing the column-integrated moist static energy budget associated with the northward-propagating boreal summer intraseasonal oscillation
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诊断与向北传播的北方夏季季节内振荡相关的柱积分湿静态能量收支
DOI：
10.1007/s00382-020-05249-8
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发表时间：
2020-04
期刊：
影响因子：
4.6
通讯作者：
Tim Li
中科院分区：
文献类型：
--
作者：
Tianyi Wang;Tim Li
Column-integrated moist static energy (MSE) budgets associated with the northward-propagating boreal summer intraseasonal oscillation (BSISO) are diagnosed for the Bay of Bangel (BoB) and western North Pacific (WNP) regions. While an active BSISO convection is in phase with a positive column-integrated MSE perturbation, the MSE tendency exhibits a marked north–south asymmetry about the convection, with positive (negative) anomaly to its north (south). An MSE budget diagnosis reveals that the advection of anomalous MSE by the background southwesterly plays a dominant role in causing such an asymmetry and thus promotes the northward propagation, as the anomalous rainband associated with the BSISO has a northwest-southeast tilted structure. The anomalous BSISO wind plays a negative role, because the low-level easterly anomaly to the north of the BSISO convection tends to suppress the surface evaporation through reduced near-surface wind speed, inhibiting the north–south asymmetry. In addition, as maximum background MSE appears over the Asian land region, the advection by the low-level easterly anomaly contributes negatively over the WNP while it has little impact over the BoB. When the BSISO convection is near the equator, a much stronger subsidence anomaly appears to the north than the south due to the equatorial asymmetry of the summer mean state. This leads to a greater MSE tendency north of the equator due to greater anomalous vertical MSE advection, supporting the initiation of the northward propagation.
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影响因子：
3.1
作者：
Á. Adames;J. Wallace
通讯作者：
Á. Adames;J. Wallace
影响因子：
0.8
作者：
Tim Li;Bin Wang
通讯作者：
Tim Li;Bin Wang
影响因子：
4.6
作者：
P. Pillai;A. Sahai
通讯作者：
P. Pillai;A. Sahai
影响因子：
3.1
作者：
G. Katul;J. Albertson;C. Hsieh;P. Conklin;J. Sigmon;M. Parlange;K. Knoerr
通讯作者：
G. Katul;J. Albertson;C. Hsieh;P. Conklin;J. Sigmon;M. Parlange;K. Knoerr
影响因子：
3.2
作者：
E. Kalnay;A. Dalcher
通讯作者：
E. Kalnay;A. Dalcher