Guðrún Nína Petersen and Ian A. Renfrew Aircraft-based observations of air-sea fluxes over Denmark Strait and the Irminger Sea during high wind speed conditions.

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Presentation transcript:

Guðrún Nína Petersen and Ian A. Renfrew Aircraft-based observations of air-sea fluxes over Denmark Strait and the Irminger Sea during high wind speed conditions

Greenland Flow Distortion Experiment Greenland´s impact on local and downstream weather Low-level wind jets Air-sea fluxes Targeted observations See Renfrew et al. Bulletin AMS, Sept. 2008

U,p: a five-port pressure measurement system, 32 Hz T: Rosemount temperature sensor, 32 Hz q: Lyman-Alpha hygrometer, 64 Hz SST: Heimann radiometer, 4 Hz FAAM: Facility for Airborne Atmospheric Measurements 6 h endurance flight-level down to m above sea level

Aircraft vs. ship Platform independent of sea surface Flow distortion effects more uniform Quantity of data much lower Run choice needs consideration –2 minutes ~ 12 km

Low-level flight legs 6 flights – 5 available for direct flux calculations 5 hours 22 min of high frequency data 145 runs –131 over open water Altitude above the sea: m

Eddy covariance fluxes Momentum Sensible heat Latent heat Bulk fluxes Momentum Sensible heat Latent heat

Quality control Follows French et al. (2007), Drennan et al. (2007) –power spectra –linear cumulative summation of the covariances –cospectra of the covariances –ogives 131 flux runs over ocean  120 accepted for wind stress  109 for sensible heat flux  102 for latent heat flux COARE3.0 review noted only 133 & 85 from 7000 h of momentum & latent flux obs for U > 15 m s -1 in ETL database

Wind stress Ranges: U 10N : 5 – 25 m/s and Wind stress: Nm -2

Sensible heat flux Wm -2 Latent heat flux Wm -2

C DN - momentum For U 10N : ms -1, C DN = 2.04 x 10 -3

C DN - momentum For U 10N : ms -1, C DN = 2.04 x 10 -3

C DN - momentum For U 10N : ms -1, C DN = 2.04 x 10 -3

C DN - momentum For U 10N : ms -1, C DN = 2.04 x 10 -3

C DN - momentum For U 10N : ms -1, C DN = 2.04 x 10 -3

C EN – latent heat For U 10N : ms -1, C EN = 1.57 x 10 -3

C HN – sensible heat For U 10N : ms -1, C HN = 1.63 x 10 -3

B276: 5 March 2007

LH – spatial map

C EN – spatial map

Summary The GFDex air-sea data set is obtained in high wind speed, cold-air outbreak conditions Aircraft measurements from m above the sea 131 flux runs over open water U 10N : 5-25 m/s Wind stress: Nm -2 Total heat flux: Wm -2 The mean exchange coefficients, U 10N : m/s –C DN = 2.04 x –C HN = 1.63 x –C EN = 1.57 x Petersen, G. N. and I. A. Renfrew, 2009: Aircraft-based observations of air-sea fluxes over Denmark Strait and the Irminger Sea during high wind speed conditions, Quarterly J. Royal Meteorol. Soc., in press.

Future Work Investigate ‘unusally high’ C EN and C HN –Role of waves? –Role of sea spray? –Some discrepancy due to aircraft?

Intercomparison: Normalized histo- grams of detrended data, 2-min runs