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WEEKLY GLACIOLOGICAL OUTLOOK IN ANTARCTIC OPERATION

  Apr 27 to May 07, 2012  

SIGLANT 17/12

(Above abbreviation stands for Spanish version)

 Zone 1.      Drake Passage (pasaje Drake)³

 Open waters

 1.1 South Atlantic - Scotia Sea (Atlántico Sur - mar del Scotia)³

 ICEBERGS

C19 C C19 C LAT 60° 27’ S LONG 53° 08’ W  DIMENSION 21x12 NM

The preceding information is based on satellite images of different resolutions and dates, as well as in foreign analysis. 

It synthesizes the general conditions of sea ice and icebergs greater than 10 MN for the period.  Conditions described can vary in opportunity of visual observations in situ and as function of prevailing weather.

Zone 2.      South Orkney Islands and surrounding (islas Orcadas del Sur y adyacencias)³

 South Orkney Islands (islas Orcadas del Sur)³: 20 NM southern to Orkney island concentration 9-10/10 first year and old ice with icebergs, bergy bits and growlers. Sea ice fields in this zone are subject to variations of extension, concentration and pressure as function of predominant winds. 

Jessie Bay (Bahía Uruguay)³: 2/10 first year ice with icebergs, bergy bits and growlers².

Scotia Bay (Bahía Scotia)³: 2/10 new and young ice  with icebergs, bergy bits and growlers².

 Zone 3.      Bransfield Strait (Mar de la Flota)³ and South Shetland Islands (islas Shetland del Sur)³

Bransfield Strait (Mar de la Flota)³ open waters, with icebergs, bergy bits and growlers.

South Shetland Islands (islas Shetland del Sur)³: Open waters with icebergs, bergy bits and growlers².

 Zona 4.      Channels to Adelaide Island (Canales a isla Belgrano)³

5-7/10 Young and first year ice with icebergs, bergy bits and growlers.

Adelaide Island (isla Belgrano)³ 1-2/10 first year ice with old ice in bay with icebergs, bergy bits and growlers².

Zona 5.      Bellingshausen Sea and Marguerite Bay

(mar de Bellingshausen y bahía Margarita)³

In Bellingshausen Sea (mar de Belligshausen)³: the ice field is from 5948S/05530W  following to 6318S/06218W 6442S/06518W 6448S/06600W 6836S/07006W 6948S/07636W 7042S/08542W to 6912S/09000W ,  with first year ice, young and old, with icebergs, bergy its and growlers  

Marguerite Bay (bahía Margarita)³ 0-1/10 first year ice with icebergs, bergy bits and growlers .

Zone 6.      Antarctic Strait and Erebus and Terror Gulf

(estrecho Antarctic y golfo Erebus y Terror)³

Antarctic Strait (estrecho Antarctic)³    1/10 old ice with icebergs, bergy bits and growlers².

Hope Bay (bahía Esperanza)³:2/10 old ice with icebergs, bergy bits and growlers².

Erebus and Terror Gulf (golfo Erebus y Terror)³: 8-10/10 old and first year ice with icebergs, bergy bits and growlers².

Sea ice fields in this zone are subject to variations of extension, concentration and pressure as function of predominant winds.

 Zone 7.      General Weddell Sea (mar de Weddell general)³

Pack ice from: 5948S/05530W following to 6100S/05054W 6100S/04454W 6130S/04030W 6436S/03606W 6554S/02842W 6548S/02306W 6512S/01942W 6754S/00948W to 6648S/00000W, predominant 9-10/10 old and first year ice, with icebergs, bergy bits and growlers².

 

Zone 8.      Weddell NW Sea. (mar de Weddell Noroeste)³

(From Snow Hill Island (isla Cerro Nevado)³ to Jason Peninsula (península Jason)³)

Snow Hill Island (Isla Cerro Nevado)³  7-8/10 fast first year ice with icebergs, bergy bits and growlers²

Jason Peninsula (península Jason)³ 9-10/10 old and first year ice with icebergs, bergy bits and growlers².

 Zone 9.      South Weddell Sea. (mar de Weddell Sur)³

Halley Base to Berkner Island (Base Halley a isla Berkner)³

Halley Base (Base Halley)³ vicinities, 1/10 young and new ice with icebergs, bergy bits and growlers².

From Dawson-Lambton Ice Stream (glaciar Buenos Aires)³ to Belgrano II base (base Belgrano II)³: 10/10 fast ice with open waters in channel to Belgrano II base

Northern Filchner Ice Shelf (barrera de Filchner hacia el Norte)³ and eastern of iceberg tongue: fast ice with 10/10 old ice.

Ice Edge Position

Ice edge between LON 00° - 131ºW updated ABR 27, 2011

6636S/00000W 6630S/00130W 6630S/00236W 6624S/00454W 6600S/00942W 6548S/01154W 6542S/01248W

6530S/01342W 6518S/01454W 6454S/01548W 6436S/01654W 6412S/01818W 6400S/01948W 6354S/02030W

6336S/02212W 6336S/02300W 6330S/02348W 6330S/02424W 6324S/02506W 6318S/02542W 6306S/02642W

6300S/02706W 6300S/02736W 6254S/02806W 6248S/02906W 6248S/02930W 6248S/02954W 6248S/03036W

6248S/03106W 6248S/03130W 6248S/03148W 6242S/03236W 6230S/03348W 6212S/03436W 6200S/03512W

6130S/03606W 6124S/03712W 6118S/03754W 6054S/03948W 6048S/04130W 6042S/04342W 6036S/04454W

6030S/04542W 6024S/04630W 6012S/04742W 5948S/04854W 5936S/04948W 5930S/05118W 5936S/05242W

5948S/05342W 5954S/05418W 5948S/05530W 5942S/05606W 6000S/05630W 6006S/05718W 6036S/05800W

6118S/05830W 6136S/05830W 6148S/05830W 6154S/05842W 6154S/05854W 6218S/06024W 6230S/06118W

6248S/06142W 6254S/06148W 6318S/06230W 6354S/06300W 6406S/06336W 6424S/06400W 6436S/06424W

6448S/06436W 6512S/06518W 6518S/06536W 6524S/06548W 6530S/06548W 6554S/06612W 6600S/06624W

6600S/06642W 6606S/06654W 6612S/06712W 6618S/06718W 6618S/06724W 6618S/06736W 6624S/06748W

6636S/06818W 6642S/06836W 6648S/06848W 6700S/06912W 6706S/06924W 6712S/06948W 6718S/06954W

6724S/07000W 6730S/07000W 6742S/07000W 6748S/06948W 6754S/06936W 6754S/06924W 6800S/06918W

6800S/06912W 6806S/06918W 6812S/06930W 6812S/06942W 6812S/07012W 6812S/07024W 6812S/07048W

6812S/07112W 6812S/07130W 6812S/07148W 6818S/07206W 6824S/07212W 6824S/07218W 6830S/07218W

6830S/07224W 6830S/07230W 6836S/07236W 6830S/07248W 6830S/07254W 6830S/07306W 6830S/07318W

6830S/07330W 6830S/07342W 6836S/07406W 6842S/07424W 6848S/07448W 6854S/07506W 6900S/07542W

6906S/07606W 6918S/07636W 6924S/07700W 6936S/07718W 6942S/07742W 6954S/07754W 7000S/07806W

7006S/07818W 7012S/07842W 7012S/07906W 7012S/07930W 7012S/07942W 7012S/07954W 7006S/08012W

7000S/08018W 6954S/08024W 6942S/08036W 6936S/08036W 6930S/08100W 6930S/08112W 6930S/08136W

6936S/08200W 6936S/08212W 6942S/08224W 6942S/08236W 6942S/08254W 6942S/08330W 6942S/08348W

6936S/08436W 6930S/08512W 6930S/08536W 6924S/08606W 6912S/08642W 6906S/08654W 6906S/08706W

6900S/08718W 6900S/08736W 6900S/08800W 6900S/08836W 6906S/08918W 6906S/08948W 6912S/09000W

6912S/09100W 6918S/09118W 6918S/09148W 6924S/09224W 6930S/09318W 6936S/09348W 6936S/09412W

6936S/09442W 6930S/09548W 6936S/09618W 6936S/09636W 6942S/09706W 6942S/09724W 6948S/09742W

6948S/09800W 6948S/09818W 6948S/09848W 6942S/09918W 6942S/09942W 6942S/10000W 6936S/10024W

6930S/10036W 6924S/10048W 6912S/10112W 6912S/10136W 6912S/10200W 6912S/10230W 6918S/10242W

6924S/10300W 6930S/10312W 6942S/10342W 6954S/10418W 7006S/10512W 7012S/10542W 7012S/10606W

7012S/10636W 7018S/10706W 7024S/10724W 7030S/10748W 7042S/10824W 7048S/10848W 7042S/10918W

7036S/10948W 7030S/11000W 7024S/11024W 7024S/11042W 7030S/11106W 7030S/11118W 7036S/11130W

7042S/11142W 7042S/11218W 7036S/11242W 7036S/11306W 7030S/11336W 7036S/11436W 7036S/11454W

7048S/11624W 7054S/11654W 7100S/11730W 7106S/11824W 7100S/11924W 7100S/11948W 7054S/12012W

7048S/12054W 7024S/12148W 7006S/12242W 6948S/12406W 6936S/12518W 6936S/12648W 6948S/12842W

7012S/13100W                                                                              

 

NOTE: The preceding information is based on satellite images of different resolutions and dates, as well as in foreign analysis.  It synthesizes the general conditions of sea ice and icebergs greater than 10 MN for the period indicated in the subtitle of the first page heading.  Conditions described can vary in opportunity of visual observations in situ and as function of prevailing weather.

2 Growlers. In Antarctic seas, in ice free or open waters, in ice fields zones, and especially, in vicinities of floes, drifting pieces of hard and small ice called growlers used to drift along. These are the most dangerous pieces of ice for ships

because:

(1) are of small size, less than 20 square meters of surface, being extremely difficult to be detect either by radar, as by eye observation, as well as when being surrounded by sea ice or high sea state, (2) are very hard as a consequence of their crystalline structures consolidation, (3) are generally of whitish appearance, sometimes transparent or of bluish-green color usually showing mimicry with seawater color, (4) because sail in subsurface waters emerging to the surface from time to time. Growlers produce sounds as growls when drifting; that is the reason of their name.

3 Toponymics. British geographic names (Argentine geographic names).