brief overview of the arctic mediterranean seas data in carina

Brief Overview of the Arctic Mediterranean Seas Data in CARINA

Are Olsen, Robert Key, Eva Falck, Emil Jeanson, Anders Olsson, Sara Jutterström, Leif Anderson, Ingunn Skjelvan,

Benjamin Pfeil, Jon Olafsson, Thorarinn Aranarson

GLODAP (Key et al.) data in the Arctic

• Only ~20 stations north of Greenland Scotland

ridge.

• None in the Arctic!

Arctic Mediterranean Seas Data in CARINA

Data from 53 cruises, 1982 – 2003

Region: Nordic SeasArctic OceanBaffin Bay, Canadian Archipelago

Arctic Data

SBI - spring

Oden 91

Polarstern 96

AO

S 94

Northwater Polynya

Arctic Data

SBI - spring

Oden 91

Polarstern 96

AO

S 94

Pol

arst

ern

93

Tundra 94

JOIS 97

SBI SUMMER

YMER 80

Northwater Polynya

Nordic Seas data

Iceland time series

Hudson 82Since early 90’s:ESOP1ESOP 2TRACTORIMR/PMEL/Brookhaven/Kiel tracer data

Northeast water Polynya

Norwegian Projects 99-02

Issues

• Precision• Accuracy• Trends

precision/accuracy/trends

precision/accuracy/trends

null out im

precise data

precision/accuracy/trends

2160

1982 2002

2160

precision/accuracy/trends

20 % = 2 mol kg-1

-20 % = -2 mol kg-1

Adjustments from first inversion of crossover results

110 crossover analyses for each of DIC, At, nutrients, Salinity, oxygen, CFCs, 300-400 km radius, >2000 m, mostly Greenland Basin. Totalling 660 results

’82 cruise

precision/accuracy/trends

2160

1982

2160

2002

-20 mol/kg

DIC DIC

precision/accuracy/trends

2160

1982

2160

2002

-20 mol/kg

DIC DIC

-25 mol/kg

precision/accuracy/trends

Locking points.Use these to defineany trend and evaluateadjustements in light of this

Summary

• Data from 53 cruises covering Nordic Seas, Arctic Ocean and marginal seas have been gathered in one collection.

• Where possible (depends on region) the quality of data has been assessed.

• Xover analysis and inversion is being carried out to ensure internal consistency and determine adjustments.

• Other methods: MLR, basin averages

• Have to be careful and not overdo so trends are preserved, this is the tricky part.