| DOI: | 10.1175/JCLI-D-11-00021.1
|
| Scopus记录号: | 2-s2.0-84856956129
|
| 论文题名: | Multidecadal warming and shoaling of antarctic intermediate water |
| 作者: | Schmidtko S.; Johnson G.C.
|
| 刊名: | Journal of Climate
|
| ISSN: | 8948755
|
| 出版年: | 2012
|
| 卷: | 25, 期:1 | | 起始页码: | 207
|
| 结束页码: | 221
|
| 语种: | 英语
|
| Scopus关键词: | Antarctic circumpolar current
; Antarctic intermediate waters
; Atlantic Ocean
; Conductivity temperature depths
; Core potential
; CTD profiles
; Density reduction
; Historical records
; Multidecadal variability
; Ocean basins
; Potential density
; Potential temperature
; Profile data
; Salinity trends
; Sea surface temperature anomalies
; South Atlantic
; Southern Annular Mode
; Southern Hemisphere
; Southern Ocean
; Temporal property
; Trends
; Water mass
; Bottles
; Climatology
; Ocean currents
; Salinity measurement
; Hydrographic surveys
; air-sea interaction
; Antarctic Intermediate Water
; Argo
; climatology
; decadal variation
; salinity
; sea surface temperature
; shipborne measurement
; shoaling wave
; Southern Hemisphere
; temperature anomaly
; trend analysis
; warming
; Antarctic Circumpolar Current
; Atlantic Ocean
; Atlantic Ocean (Southeast)
; Pacific Ocean
; Pacific Ocean (Southeast)
; Southern Ocean
|
| 英文摘要: | Antarctic Intermediate Water (AAIW) is a dominant Southern Hemisphere water mass that spreads from its formation regions just north of the Antarctic Circumpolar Current (ACC) to at least 208S in all oceans. This study uses an isopycnal climatology constructed from Argo conductivity-temperature-depth (CTD) profile data to define the current state of the AAIW salinity minimum (its core) and thence compute anomalies of AAIW core pressure, potential temperature, salinity, and potential density since the mid-1970s from shipbased CTD profiles. The results are used to calculate maps of temporal property trends at the AAIW core, where statistically significant strong circumpolar shoaling (30-50 dbar decade21), warming (0.058-0.158C decade21), and density reductions [up to20.03 (kg m23) decade21] are found. These trends are strongest just north of the ACC in the southeast Pacific and Atlantic Oceans and decrease equatorward. Salinity trends are generally small, with their sign varying regionally. Bottle data are used to extend the AAIW core potential temperature anomaly analysis back to 1925 in the Atlantic and to;1960 elsewhere. The modern warmAAIW core conditions appear largely unprecedented in the historical record: biennially and zonally binned median AAIW core potential temperatures within each ocean basin are, with the notable exception of the subtropical South Atlantic in the 1950s-70s, 0.2-18C colder than modern values. Zonally averaged sea surface temperature anomalies around the AAIW formation latitudes in each ocean and sectoral southern annular mode indices are used to put the AAIW core property trends and variations into context. © 2012 American Meteorological Society. |
| Citation statistics: |
|
| 资源类型: | 期刊论文
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/52614
|
| Appears in Collections: | 气候变化事实与影响
|
|
There are no files associated with this item.
|
|
作者单位: | National Oceanic and Atmospheric Administration/Pacific Marine Environmental Laboratory, Seattle, WA, United States
|
| Recommended Citation: | |
Schmidtko S.,Johnson G.C.. Multidecadal warming and shoaling of antarctic intermediate water[J]. Journal of Climate,2012-01-01,25(1)
|
|
|