On the spatio-temporal variations of the tropopause height over india and indian summer monsoon activity

Kulkarni, J. R.; Verma, R. K.

doi:10.1007/bf02656973

Cited by 5 publications

(4 citation statements)

References 4 publications

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“…Thus in DRY years thermal winds (westerly) are such that TEJ is weaker and the winds of the lower stratosphere are strong easterlies (thermal wind is easterly). It is inferred that the tropopause in this region is lower in DRY years than in WET years of monsoon and it is supported for the Indian region [12].…”

Section: A Dipole In Tropical Easterly Zonal Wind In the Ut/ls Regionmentioning

confidence: 76%

“…It is seen that this weakening of the north-south temperature gradient is a global phenomenon. Available studies show that in the sub-tropics DRY monsoon has lower tropopause height over India [12]. Since the upper tropospheric cooling in DRY years is a global phenomenon, the sub-tropical tropopause globally over Northern Hemisphere may have a lower height in DRY years compared to WET years.…”

Section: A Possible Mechanism For the Dipole Structure Of Zonal Windsmentioning

confidence: 99%

“…Several studies in the past established the link between the stratospheric zonal wind and Indian summer monsoon [9]- [11]. The composite of mean tropopause height for excess and deficient monsoon years showed that all India mean tropopause height is statistically higher in excess monsoon years than the deficient monsoon years [12]. Rajeevan has studied the upper tropospheric circulation and thermal anomalies over the central Asia associated with major drought and floods in India using the upper air data of 21 stations for 22 years (1961-1982) [13].…”

Section: Introductionmentioning

confidence: 99%

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Variation of Zonal Winds in the Upper Troposphere and Lower Stratosphere in Association with Deficient and Excess Indian Summer Monsoon Scenario

Madhu¹

2014

ACS

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The Indian summer monsoon is one of the most dominant tropical circulation systems in the general circulation of the atmosphere. The country receives more than 80% of the annual rainfall during a short span of four months (June to September) of the southwest monsoon season. Variability in the quantum of rainfall during the monsoon season has profound impacts on water resources, power generation, agriculture, economics and ecosystems in the country. The inter annual variability of Indian Summer Monsoon Rainfall (ISMR) depends on atmospheric and oceanic conditions prevailed during the season. In this study we have made an attempt to understand the variation of the of zonal winds in the tropical Upper Troposphere and Lower Stratosphere (UT/LS) region during deficient and Excess rainfall years of Indian summer monsoon and its relation to Indian Summer Monsoon Rainfall (ISMR). It is found that in the equatorial Upper Troposphere zonal winds have westerly anomalies during deficient rainfall year's and easterly anomaly during excess rainfall years of Indian summer monsoon and opposite zonal wind anomaly is noted in the equatorial Lower Stratosphere during the deficient and excess rainfall years of Indian summer monsoon. It is also found that the June to September upper troposphere zonal winds averaged between 15˚N and 15˚S latitudes have a long-term trend during 1960 to 1998. Over this period the tropical easterlies and the tropical jet stream have weakened with time.

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Section: A Dipole In Tropical Easterly Zonal Wind In the Ut/ls Regionmentioning

confidence: 76%

Section: A Possible Mechanism For the Dipole Structure Of Zonal Windsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Variation of Zonal Winds in the Upper Troposphere and Lower Stratosphere in Association with Deficient and Excess Indian Summer Monsoon Scenario

Madhu¹

2014

ACS

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“…Recently, RavindraBabu et al (2019) reported a connection between the CPT and onset of ISM. Kulkarni and Verma (1993) observed higher CPT during active monsoon than weak monsoon years (Varikoden & Preethi, 2013). Ramanadham et al (1969) reported that the TEJ core is situated between the peaks of the frequency distribution of the

H_{CPT}

over a few stations in the ISM.…”

Section: Introductionmentioning

confidence: 99%

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

Mehta

2024

Atmospheric Science Letters

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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 () show amalgams of two categories of variability on the day‐to‐day scale. In category1 occurs close to and they show in‐phase variation. While in Category2 occurs far apart from and they do not show any relationship. For Category1 and are strongly correlated (0.70), as well as and (CPT temperature) are moderately anticorrelated (−0.55) significant at a 95% confidence level, indicating the dominance of adiabatic processes. Whereas in Category2 and 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.

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Cloud characteristics over the rain-shadow region of North Central peninsular India during monsoon withdrawal and post-withdrawal periods

et al. 2015

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On the spatio-temporal variations of the tropopause height over india and indian summer monsoon activity

Cited by 5 publications

References 4 publications

Variation of Zonal Winds in the Upper Troposphere and Lower Stratosphere in Association with Deficient and Excess Indian Summer Monsoon Scenario

Variation of Zonal Winds in the Upper Troposphere and Lower Stratosphere in Association with Deficient and Excess Indian Summer Monsoon Scenario

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

Cloud characteristics over the rain-shadow region of North Central peninsular India during monsoon withdrawal and post-withdrawal periods

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