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Coupling between leading modes in the troposphere-stratosphere interaction

对流层-平流层相互作用中主模之间的耦合

基本信息

批准号：
16540400
负责人：
ITOH Hisanori
金额：
$ 2.37万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16540400/
关键词：
interaction between the troposphere and stratosphere North Atlantic Oscillation Pacific-North American Oscillation annular mode non-uniform zonal field sudden warming independent component predictability 気象学気候変動非帯状基本場プラネタリー波太平洋

项目摘要

Studies about the stratosphere have been performed from the framework of the zonal mean and deviations from it, and their interaction. However, there are many cases that cannot be explained from this framework, and thereby a new framework is needed. It is the framework of time mean (non-uniform zonal field) and deviations from it. The present study is the first comprehensive research from this framework. In particular, no numerical study from this standpoint has been done, therefore this research is the first in the world.Data analyses about the coupling between the troposphere and stratosphere show the followings : The Pacific-North American pettern (PNA) in the troposphere vertically propagates into the stratosphere, causing the wavenumber 1 (W1) pattern. The dominance of the PNA in the troposphere via the excitation of the W1 mode amplifies the annular mode in the stratosphere. In some cases, this coupling causes sudden warmings. These sequences are clearly different from the AO.Next, by using numerical models, we successfully simulate phenomena in which dominant wavenumbers are different between the troposphere and stratosphere. For this success, a non-uniform zonal field is indispensable. Furthermore, the coupling from the PNA in the troposphere via W1 to the AM in the stratosphere can be simulated by a time integration model.We further proceed to the study about the reality of dominant modes in the troposphere. The conclusion is that although the North Atlantic Oscillation (NAO) and PNA are independent, dominant oscillations in the troposphere, the AO apparently appears due to the spatial correlation of the NAO and PNA. This conclusion verifies our approach that the PNA and NAO are treated in the troposphere.The predictability of the sudden warming is also studied. As a result, we show that sudden warmings caused by wavenumbers 2 or 3 are more difficult in their prediction than those caused by wavenumber 1.

关于平流层的研究是从纬向平均和偏离纬向平均的框架及其相互作用进行的。然而，有许多情况不能用这个框架来解释，因此需要一个新的框架。它是时间平均（非均匀纬向场）及其偏差的框架，本研究是首次从这一框架出发进行的综合研究。对对流层与平流层耦合的资料分析表明：对流层中的太平洋-北美型（PNA）垂直传播到平流层中，形成波数1（W1）型; PNA在对流层中的优势通过W1模的激发放大了平流层中的环形模。在某些情况下，这种耦合会导致突然升温。这些序列明显不同于AO。接下来，通过使用数值模式，我们成功地模拟了对流层和平流层之间的主导波数不同的现象。为了取得这种成功，非均匀带状场是必不可少的。此外，对流层PNA经W1与平流层AM的耦合可以用时间积分模式来模拟，并进一步研究了对流层主导模态的真实性。结果表明，虽然北大西洋涛动（NAO）和PNA是对流层中独立的主导振荡，但由于NAO和PNA的空间相关性，AO明显出现。这一结果验证了我们在对流层中处理PNA和NAO的方法，并对突然增暖的可预报性进行了研究。结果表明，由波数2或3引起的突然变暖比由波数1引起的更难预测。