Effects of convective ice evaporation on interannual variability of tropical tropopause layer water vapor
Water vapor interannual variability in the tropical tropopause layer (TTL) is investigated using satellite observations and model simulations. We break down the influences of the Brewer–Dobson circulation (BDC), the quasi-biennial oscillation (QBO), and the tropospheric temperature (Δ<i>T&...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2018-04-01
|
| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://www.atmos-chem-phys.net/18/4425/2018/acp-18-4425-2018.pdf |
| _version_ | 1819146644543766528 |
|---|---|
| author | H. Ye A. E. Dessler W. Yu |
| author_facet | H. Ye A. E. Dessler W. Yu |
| author_sort | H. Ye |
| collection | DOAJ |
| description | Water vapor interannual variability in the tropical tropopause
layer (TTL) is investigated using satellite observations and model
simulations. We break down the influences of the Brewer–Dobson circulation
(BDC), the quasi-biennial oscillation (QBO), and the tropospheric temperature
(Δ<i>T</i>) on TTL water vapor as a function of latitude and longitude using
a two-dimensional multivariate linear regression. This allows us to examine the
spatial distribution of the impact of each process on TTL water vapor. In
agreement with expectations, we find that the impacts from the BDC and QBO act
on TTL water vapor by changing TTL temperature. For Δ<i>T</i>, we find that
TTL temperatures alone cannot explain the influence. We hypothesize a
moistening role for the evaporation of convective ice from increased deep
convection as the troposphere warms. Tests using a chemistry–climate model,
the Goddard Earth Observing System Chemistry Climate Model (GEOSCCM), support this hypothesis. |
| first_indexed | 2024-12-22T13:17:12Z |
| format | Article |
| id | doaj.art-938d403a7c894c80929e2c4fd3d127df |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-22T13:17:12Z |
| publishDate | 2018-04-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-938d403a7c894c80929e2c4fd3d127df2022-12-21T18:24:35ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242018-04-01184425443710.5194/acp-18-4425-2018Effects of convective ice evaporation on interannual variability of tropical tropopause layer water vaporH. Ye0A. E. Dessler1W. Yu2Department of Atmospheric Sciences, Texas A&M University, College Station, TX, USADepartment of Atmospheric Sciences, Texas A&M University, College Station, TX, USADepartment of Atmospheric Sciences, Texas A&M University, College Station, TX, USAWater vapor interannual variability in the tropical tropopause layer (TTL) is investigated using satellite observations and model simulations. We break down the influences of the Brewer–Dobson circulation (BDC), the quasi-biennial oscillation (QBO), and the tropospheric temperature (Δ<i>T</i>) on TTL water vapor as a function of latitude and longitude using a two-dimensional multivariate linear regression. This allows us to examine the spatial distribution of the impact of each process on TTL water vapor. In agreement with expectations, we find that the impacts from the BDC and QBO act on TTL water vapor by changing TTL temperature. For Δ<i>T</i>, we find that TTL temperatures alone cannot explain the influence. We hypothesize a moistening role for the evaporation of convective ice from increased deep convection as the troposphere warms. Tests using a chemistry–climate model, the Goddard Earth Observing System Chemistry Climate Model (GEOSCCM), support this hypothesis.https://www.atmos-chem-phys.net/18/4425/2018/acp-18-4425-2018.pdf |
| spellingShingle | H. Ye A. E. Dessler W. Yu Effects of convective ice evaporation on interannual variability of tropical tropopause layer water vapor Atmospheric Chemistry and Physics |
| title | Effects of convective ice evaporation on interannual variability of tropical tropopause layer water vapor |
| title_full | Effects of convective ice evaporation on interannual variability of tropical tropopause layer water vapor |
| title_fullStr | Effects of convective ice evaporation on interannual variability of tropical tropopause layer water vapor |
| title_full_unstemmed | Effects of convective ice evaporation on interannual variability of tropical tropopause layer water vapor |
| title_short | Effects of convective ice evaporation on interannual variability of tropical tropopause layer water vapor |
| title_sort | effects of convective ice evaporation on interannual variability of tropical tropopause layer water vapor |
| url | https://www.atmos-chem-phys.net/18/4425/2018/acp-18-4425-2018.pdf |
| work_keys_str_mv | AT hye effectsofconvectiveiceevaporationoninterannualvariabilityoftropicaltropopauselayerwatervapor AT aedessler effectsofconvectiveiceevaporationoninterannualvariabilityoftropicaltropopauselayerwatervapor AT wyu effectsofconvectiveiceevaporationoninterannualvariabilityoftropicaltropopauselayerwatervapor |