Stratosphere Troposphere Interactions

Mohanakumar, K.

doi:10.1007/978-1-4020-8217-7

Cited by 108 publications

(90 citation statements)

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“…Additionally, the folding of the dynamic tropopause in association with intense upper tropospheric frontogenesis has been cited as one of the most efficient and dominant forms of stratosphere-troposphere exchange in the midlatitudes (Mohanakumar, 2008). The role of individual ULJFs, specifically the upper tropospheric front, in stratosphere-troposphere exchange has been well documented (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…As a result of the synoptic and mesoscale processes in the vicinity of a tropopause fold, dry, ozone-rich stratospheric air descends into the troposphere and can irreversibly mix with tropospheric air. It is hypothesized that at least 10% of global tropospheric ozone originates from the stratosphere via intense upper tropospheric frontogenesis and tropopause folding (Mohanakumar, 2008).…”

Section: Introductionmentioning

confidence: 99%

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The structure and evolution of lower stratospheric frontal zones. Part 1: Examples in northwesterly and southwesterly flow

Lang

Martin

2012

Quart J Royal Meteoro Soc

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The structure, evolution and dynamics of two lower stratospheric frontal zones are examined from a basic state variables perspective. The case studies highlight the asynchronous evolution of the lower stratospheric and upper tropospheric frontal portions of upper level jet-front (ULJF) systems, as well as some substantial differences in lower stratospheric frontal development that occur in southwesterly and northwesterly flow. The evolution of the ULJF in northwesterly flow was characterized by an initially intense but weakening lower stratospheric front along with an initially weak but intensifying upper tropospheric front. Throughout the evolution, geostrophic cold air advection in cyclonic shear characterized a substantial portion of the lower stratospheric front. This circumstance supported subsidence through the local jet core within the cold upper troposphere, weakening the lower stratospheric front via tilting. This subsidence extended downward below the jet core where it is suggested to have played a role in the early stages of upper tropospheric frontogenesis. In the southwesterly flow case, the evolution of the ULJF was characterized by a strengthening lower stratospheric front and a weakening upper

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The structure and evolution of lower stratospheric frontal zones. Part 1: Examples in northwesterly and southwesterly flow

Lang

Martin

2012

Quart J Royal Meteoro Soc

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“…Stratosphere-troposphere exchange (STE) is a part of the general circulation of the atmosphere that transports air and atmospheric constituents across the tropopause (Mohanakumar, 2008). Diffusive and convective transports cause exchange of air between the boundary layer and the free troposphere, carrying ozone and its precursors to higher altitudes (Roelofs and Lelieveld, 2000).…”

Section: Introductionmentioning

confidence: 99%

Study of Stratosphere‐troposphere exchange events of ozone in India and Greece using ozonesonde ascents

Ganguly

Tzanis

2011

Meteorological Applications

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Stratosphere-troposphere Exchange (STE) is an important factor controlling the budget of ozone in the upper troposphere and lower stratosphere. Studies of STE events in India are so far restricted to co-ordinated campaigns, and measurements over longer periods are relatively scarce. In the light of this observation, this paper aims to identify the Indian latitudes most likely to be affected by STE, the frequency of occurrence of shallow and deep STE events, the depth up to which the ozone from the stratosphere descends into the troposphere during STE events and the resultant trend of ozone in the troposphere under the possible influence of STE over the 24 years from 1982 to 2006. In addition, a case study of the STE of ozone, which occurred during a cut-off low event at Athens, Greece, is presented in order to understand the parameters that may contribute to the evolution of these events. It is concluded that STE plays a minor role in the Indian tropospheric ozone budget. On the whole, the occurrence of STE events in India is found to increase with increase in latitude and occur more frequently during winter followed by summer. The occurrence of deep STE is higher at high latitudes while the occurrence of shallow STE is higher at low latitudes.

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“…They have made an attempt to establish the inter link between long-term change in TOC with atmospheric dynamics and chemistry coupled processes parameters like emission of Ozone Depleted Substance (ODS) as chemical catalyst Chlorofluorocarbons (CFCs), etc., stratospheric temperature, stratospheric cooling, El-Nino phenomena, planetary wave activity, tropopause height, cosmic ray, thunderstorm activities [19] [28] [37]- [43].…”

Section: Introductionmentioning

confidence: 99%

“…Brewer-Dobson circulation). Thus, an excessive amount of ozone accumulates at higher latitudes relative to the lower latitudes, where it is created [28].…”

Section: Introductionmentioning

confidence: 99%

Total Ozone Content Trend during the Last Decade over Western Indian Tropical Station i.e. Udaipur

Saxena¹,

Vyas²

2016

AJCC

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Stratosphere Troposphere Interactions

Cited by 108 publications

References 0 publications

The structure and evolution of lower stratospheric frontal zones. Part 1: Examples in northwesterly and southwesterly flow

The structure and evolution of lower stratospheric frontal zones. Part 1: Examples in northwesterly and southwesterly flow

Study of Stratosphere‐troposphere exchange events of ozone in India and Greece using ozonesonde ascents

Total Ozone Content Trend during the Last Decade over Western Indian Tropical Station i.e. Udaipur

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