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| Content Provider | Springer Nature Link |
|---|---|
| Author | DHAKA, S K KUMAR, K PRAVEEN RATNAM, M VENKAT |
| Copyright Year | 2011 |
| Abstract | Relationship of outgoing long-wave radiation (OLR) with convective available potential energy (CAPE) and temperature at the 100-hPa pressure level is examined using daily radiosonde data for a period 1980–2006 over Delhi (28.3°N, 77.1°E) and Kolkata (22.3°N, 88.2°E), and during 1989–2005 over Cochin (10°N, 77°E) and Trivandrum (8.5°N, 77.0°E), India. Correlation coefficient (R $_{xy}$) between monthly OLR and CAPE shows a significant (~ − 0.45) anti-correlation at Delhi and Kolkata suggesting low OLR associated with high convective activity during summer (seasonal variation). Though, no significant correlation was found between OLR and CAPE at Cochin and Trivandrum (low latitude region); analysis of OLR and temperature (at 100-hPa) association suggests that low OLR peaks appear corresponding to low temperature at Delhi (R $_{xy}$~ 0.30) and Kolkata (R $_{xy}$ ~ 0.25) during summer. However, R $_{xy}$ between OLR and temperature becomes opposite as we move towards low latitudes (~8°–10°N) due to strong solar cycle influence. Large scale components mainly ENSO and quasi-biennial oscillaton (QBO) that contributed to the 100-hPa temperature variability were also analyzed, which showed that ENSO variance is larger by a factor of two in comparison to QBO over Indian region. ENSO warm conditions cause warming at 100-hPa over Delhi and Darwin. However, due to strong QBO and solar signals in the equatorial region, ENSO signal seems less effective. QBO, ENSO, and solar cycle contribution in temperature are found location-dependent (latitudinal variability) responding in consonance with shifting in convective activity regime during El Niño, seasonal variability in the tropical easterly jet, and the solar irradiance. |
| Starting Page | 807 |
| Ending Page | 823 |
| Page Count | 17 |
| File Format | |
| ISSN | 02534126 |
| Journal | Journal of Earth System Science |
| Volume Number | 120 |
| Issue Number | 5 |
| e-ISSN | 0973774X |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 2011-11-12 |
| Publisher Institution | Indian Academy of Sciences |
| Publisher Place | India |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Convective available potential energy (CAPE) outgoing long-wave radiation (OLR) tropopause solar cycle quasi-biennial oscillation (QBO) El Niño/southern oscillation (ENSO) Extraterrestrial Physics, Space Sciences Earth Sciences |
| Content Type | Text |
| Resource Type | Article |
| Subject | 1900/1901 |
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