Arctic. Antarctic. Olaf Klatt Olaf Boebel. Alfred-Wegener-Institut, Bremerhaven
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1 Using Argo under sea ice Arctic Olaf Klatt Olaf Boebel Eberhard Fahrbach Alfred-Wegener-Institut, Bremerhaven Antarctic
2 Climate variability Polar regions play a critical role in setting the rate and nature of global climate variability, e.g. heat budget freshwater budget carbon budget In the past the high latitude oceans have been drastically under-sampled, particularly in winter Temperature anomalies from the climatological l i l mean (Böning et al..2008)
3 Outline Introduction Towards ice compatible floats Antarctic (Weddell Sea) realisation Ice Sensing Algorithm Interim Store RAFOS-Receivers Array of Sound sources Arctic planning Arctic ISA Physical Ice Protection
4 Ice compatibility of Argo floats: a 3 step process Ice protection (ISA, aisa) Interim storage (istore) Under Ice location (RAFOS) Aborts ascent when sea ice is expected at the surface protects the fragile parts against tthe ice pressure Provides delayed mode profile when surfacing impossible Provides subsurface profile position when surfacing impossible Successful (Weddell Sea) Successful (Weddell Sea) Successful (Weddell Sea) Arctic update under test No update is needed Installation of a small array is planed
5 Weddell Sea solutions Ice protection: Antarctic ice sensing was defined If the median of the temperature between 50db and 20db (T p=(50,45,40,35,30,25,20 dbar) ) is less C abort surface attempt Increased the survival probability and doubled the life time of floats in ice invested areas.
6 Recent Argo float distribution
7 WddllS Weddell Sea data dt WOCE: CTD-stations ti AWI floats 1100 CTD casts 7000 float profiles
8 WddllS Weddell Sea data dt WOCE: CTD-stations ti AWI floats winter winter < 300 CTD casts >3000 float profiles
9 Weddell Sea solutions Ice protection: Antarctic ice sensing was defined If the median of the temperature between 50db and 20db (T p=(50,45,40,35,30,25,20 dbar) )i is less 1.79 C abort surface attempt Increased the survival probability and doubled the life time of floats in ice invested areas. Interim storage (istore) was established For the first time a noteworthy amount of data obtained in ice covered For the first time a noteworthy amount of data obtained in ice covered areas.
10 Temperature and Salinity Cycle AWI_088 wmo number:
11 Weddell Sea solutions Ice protection: Antarctic ice sensing was defined If the median of the temperature between 50db and 20db (T p=(50,45,40,35,30,25,20 dbar) ) is less 1.79 C abort surface attempt Increased the survival probability and doubled the life time of floats in ice invested areas. Interim storage (istore) was established For the first time a noteworthy amount of data obtained in ice covered areas. Under ice location: RAFOS technique geo-referenced under ice profiles
12 Under ice location: 2009: array of 10 Sound Sources installed
13 Subsurface trajectory
14 Weddell Sea solutions Ice protection: Antarctic ice sensing was defined If the median of the temperature between 50db and 20db (T p=(50,45,40,35,30,25,20 dbar) )i is less 1.79 C abort surface attempt Increased the survival probability and doubled the life time of floats in ice invested areas. Interim storage (istore) was established For the first time a noteworthy amount of data obtained in ice covered areas. Under ice location: RAFOS technique geo-reference of under ice profiles Scientific application
15 Velocity and Temperature from the Floats To the East To the West
16 Float data in combination with a model Mean temperature of WDW in the Weddell Sea
17 WDW temperature at Greenwich meridian from CTD sections Fahrbach et al. 2010
18 Arctic Iridium Arctic ISA (ice-temperature-correlation) Physical ice protection New sensor for ice sensing photodiode
19 Falsely l ISA attributed t ice conditions Mismatc ch of ISA [%] Overall mismatch ISA: falsely ice cover ISA: falsely open water abort Temperature
20 Ice protection ti
21 Outlook: New sensor for ice sensing Transmission coefficients of water and ice
22 Deployment plan: June/July 2010 (personal comunication W. Walczowski)
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