| DOI: | 10.1175/JCLI-D-17-0670.1
|
| Scopus记录号: | 2-s2.0-85047056134
|
| 论文题名: | Diurnal cycle of the ITCZ in DYNAMO |
| 作者: | Ciesielski P.E.; Johnson R.H.; Schubert W.H.; Ruppert J.H.; Jr.
|
| 刊名: | Journal of Climate
|
| ISSN: | 8948755
|
| 出版年: | 2018
|
| 卷: | 31, 期:11 | | 起始页码: | 4543
|
| 结束页码: | 4562
|
| 语种: | 英语
|
| 英文关键词: | Atmospheric circulation
; Convection
; Convergence/divergence
; Deep convection
; Hadley circulation
; Vertical motion
|
| Scopus关键词: | Atmospheric radiation
; Heat convection
; Interactive devices
; Subsidence
; Atmospheric circulation
; Convergence/divergence
; Deep convection
; Hadley circulation
; Vertical motions
; Climatology
; atmospheric circulation
; atmospheric convection
; cloud radiative forcing
; diurnal variation
; Hadley cell
; intertropical convergence zone
; Madden-Julian oscillation
; temperature gradient
; Indian Ocean
|
| 英文摘要: | During the 2011 special observing period of the Dynamics of the Madden-Julian Oscillation (DYNAMO) field experiment, two sounding arrays were established over the central Indian Ocean, one north and one south of the equator, referred to here as the NSA and SSA, respectively. Three-hourly soundings from these arrays augmented by observations of radiation and rainfall are used to investigate the diurnal cycle of ITCZ convection during the MJO suppressed phase. During the first half of October, when convection was suppressed over the NSA but prominent over the SSA, the circulation over the sounding arrays could be characterized as a local Hadley cell. Strong rising motion was present within the ITCZ extending across the SSA with compensating subsidence over the NSA. A prominent diurnal pulsing of this cell was observed, impacting conditions on both sides of the equator, with the cell running strongest in the early morning hours (0500-0800 LT) and notably weakening later in the day (1700-2000 LT). The declining daytime subsidence over the NSA may have assisted the moistening of the low to midtroposphere there during the pre-onset stage of the MJO. Apparent heating Q1 within the ITCZ exhibited a diurnal evolution from early morning bottom-heavy profiles to weaker daytime top-heavy profiles, indicating a progression from convective to stratiform precipitation. Making use of the weak temperature gradient approximation, results suggest that both horizontal radiative heating gradients and direct cloud radiative forcing have an important influence on diurnal variations of vertical motion and convection within the ITCZ. © 2018 American Meteorological Society. |
| Citation statistics: |
|
| 资源类型: | 期刊论文
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/111538
|
| Appears in Collections: | 气候减缓与适应
|
|
There are no files associated with this item.
|
|
作者单位: | Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States; Max Planck Institute for Meteorology, Hamburg, Germany
|
| Recommended Citation: | |
Ciesielski P.E.,Johnson R.H.,Schubert W.H.,et al. Diurnal cycle of the ITCZ in DYNAMO[J]. Journal of Climate,2018-01-01,31(11)
|
|
|