Observational evidence of the relationship between the tropical tropopause and tropical easterly jet streams over the Indian monsoon region

IF 2 4区地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Science Letters Pub Date : 2024-03-13 DOI:10.1002/asl.1230

Sanjay Kumar Mehta

{"title":"Observational evidence of the relationship between the tropical tropopause and tropical easterly jet streams over the Indian monsoon region","authors":"Sanjay Kumar Mehta","doi":"10.1002/asl.1230","DOIUrl":null,"url":null,"abstract":"This paper presents the first quantitative relationship between the cold point tropopause (CPT) and tropical easterly jet (TEJ) using radiosonde observations over Gadanki (13.45° N, 79.2° E) during the Indian summer monsoon season 2006–2014. CPT and TEJ peak altitudes (<math>\n <mrow>\n <msub>\n <mi>H</mi>\n <mi>CPT</mi>\n </msub>\n <mspace></mspace>\n <mtext>and</mtext>\n <mspace></mspace>\n <msub>\n <mi>H</mi>\n <mi>TEJ</mi>\n </msub>\n </mrow></math>) show amalgams of two categories of variability on the day-to-day scale. In category1 <math>\n <mrow>\n <msub>\n <mi>H</mi>\n <mi>TEJ</mi>\n </msub>\n </mrow></math> occurs close to <math>\n <mrow>\n <msub>\n <mi>H</mi>\n <mi>CPT</mi>\n </msub>\n </mrow></math> and they show in-phase variation. While in Category2 <math>\n <mrow>\n <msub>\n <mi>H</mi>\n <mi>TEJ</mi>\n </msub>\n </mrow></math> occurs far apart from <math>\n <mrow>\n <msub>\n <mi>H</mi>\n <mi>CPT</mi>\n </msub>\n </mrow></math> and they do not show any relationship. For Category1 <math>\n <mrow>\n <msub>\n <mi>H</mi>\n <mi>CPT</mi>\n </msub>\n </mrow></math> and <math>\n <mrow>\n <msub>\n <mi>H</mi>\n <mi>TEJ</mi>\n </msub>\n </mrow></math> are strongly correlated (0.70), as well as <math>\n <mrow>\n <msub>\n <mi>H</mi>\n <mi>CPT</mi>\n </msub>\n </mrow></math> and <math>\n <mrow>\n <msub>\n <mi>T</mi>\n <mi>CPT</mi>\n </msub>\n </mrow></math> (CPT temperature) are moderately anticorrelated (−0.55) significant at a 95% confidence level, indicating the dominance of adiabatic processes. Whereas in Category2 <math>\n <mrow>\n <msub>\n <mi>H</mi>\n <mi>CPT</mi>\n </msub>\n </mrow></math> and <math>\n <mrow>\n <msub>\n <mi>T</mi>\n <mi>CPT</mi>\n </msub>\n </mrow></math> are not significantly anti-correlated. Thus, when TEJ and CPT are close to each other, it may serve as an indicator for the prevalence of the synoptic-scale effect.","PeriodicalId":50734,"journal":{"name":"Atmospheric Science Letters","volume":null,"pages":null},"PeriodicalIF":2.0000,"publicationDate":"2024-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asl.1230","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Atmospheric Science Letters","FirstCategoryId":"89","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/asl.1230","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"METEOROLOGY & ATMOSPHERIC SCIENCES","Score":null,"Total":0}

引用次数: 0

Abstract

This paper presents the first quantitative relationship between the cold point tropopause (CPT) and tropical easterly jet (TEJ) using radiosonde observations over Gadanki (13.45° N, 79.2° E) during the Indian summer monsoon season 2006–2014. CPT and TEJ peak altitudes ( $H_{CPT} and H_{TEJ}$ ) show amalgams of two categories of variability on the day-to-day scale. In category1 $H_{TEJ}$ occurs close to $H_{CPT}$ and they show in-phase variation. While in Category2 $H_{TEJ}$ occurs far apart from $H_{CPT}$ and they do not show any relationship. For Category1 $H_{CPT}$ and $H_{TEJ}$ are strongly correlated (0.70), as well as $H_{CPT}$ and $T_{CPT}$ (CPT temperature) are moderately anticorrelated (−0.55) significant at a 95% confidence level, indicating the dominance of adiabatic processes. Whereas in Category2 $H_{CPT}$ and $T_{CPT}$ are not significantly anti-correlated. Thus, when TEJ and CPT are close to each other, it may serve as an indicator for the prevalence of the synoptic-scale effect.

Abstract Image

查看原文本刊更多论文

印度季风区热带对流层顶与热带东风喷流之间关系的观测证据

本文首次利用 2006-2014 年印度夏季季风季节期间加丹基（北纬 13.45°，东经 79.2°）上空的无线电探空仪观测数据，提出了冷点对流层顶（CPT）与热带东风喷流（TEJ）之间的定量关系。CPT 和 TEJ 的峰值高度（）显示出两类日变化的混合。在第 1 类中，它们的出现时间相近，且呈现同相变化。而在第 2 类中，它们相距甚远，没有任何关系。在第 1 类中，和呈强相关（0.70），和（CPT 温度）呈中度反相关（-0.55），在 95% 的置信水平下显著，表明绝热过程占主导地位。而在第 2 类中，和没有明显的反相关性。因此，当 TEJ 和 CPT 相近时，它可以作为同步尺度效应普遍存在的指标。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Atmospheric Science Letters METEOROLOGY & ATMOSPHERIC SCIENCES-

CiteScore

4.90

自引率

3.30%

发文量

审稿时长

>12 weeks

期刊介绍： Atmospheric Science Letters (ASL) is a wholly Open Access electronic journal. Its aim is to provide a fully peer reviewed publication route for new shorter contributions in the field of atmospheric and closely related sciences. Through its ability to publish shorter contributions more rapidly than conventional journals, ASL offers a framework that promotes new understanding and creates scientific debate - providing a platform for discussing scientific issues and techniques. We encourage the presentation of multi-disciplinary work and contributions that utilise ideas and techniques from parallel areas. We particularly welcome contributions that maximise the visualisation capabilities offered by a purely on-line journal. ASL welcomes papers in the fields of: Dynamical meteorology; Ocean-atmosphere systems; Climate change, variability and impacts; New or improved observations from instrumentation; Hydrometeorology; Numerical weather prediction; Data assimilation and ensemble forecasting; Physical processes of the atmosphere; Land surface-atmosphere systems.

文献相关原料

公司名称	产品信息	采购帮参考价格