Estimating Sensible and Latent Heat Fluxes Using the Integral Method from in situ Aircraft Measurements

AbstractIn September 2009, several Aerosonde unmanned aerial vehicles (UAVs) were flown from McMurdo Station to Terra Nova Bay, Antarctica, with the purpose of collecting three-dimensional measurements of the atmospheric boundary layer (ABL) overlying a polynya. Temperature, pressure, wind speed, and relative humidity measurements collected by the UAVs were used to calculate sensible and latent heat fluxes (SHF and LHF, respectively) during three flights. Fluxes were calculated over the depth of the ABL using the integral method, in which only measurements of the mean atmospheric state (no transfer coefficients) were used. The initial flux estimates assumed that the observations were Lagrangian. Subsequent fluxes were estimated using a robust and innovative methodology that included modifications to incorporate adiabatic and non-Lagrangian processes as well as the heat content below flight level. The SHF ranged from 12 to 485 W m−2, while the LHF ranged from 56 to 152 W m−2. The importance of properly mea...

[1]  T. McGeer,et al.  Small Autonomous Aircraft for Economical Oceanographic Observations on a Wide Scale , 1993 .

[2]  Reza S. Abhari,et al.  Full-Scale Wind Turbine Near-Wake Measurements Using an Instrumented Uninhabited Aerial Vehicle , 2011 .

[3]  J. Kahl,et al.  Theoretical heights of buoyant convection above open leads in the winter Arctic pack ice cover , 1992 .

[4]  Nathaniel L. Bindoff,et al.  The sea ice dynamics of Terra Nova Bay and Ross Ice Shelf Polynyas during a spring and winter simulation , 2008 .

[5]  G. Wendler,et al.  Sea‐ice conditions in the Ross Sea during spring 1996 as observed on SAR and AVHRR imagery , 2002 .

[6]  J. Cassano,et al.  An Analysis of Near-Surface Winds, Air Temperature, and Cyclone Activity in Terra Nova Bay, Antarctica, from 1993 to 2009 , 2011 .

[7]  Shelley L. Knuth,et al.  Observations of Antarctic Polynya With Unmanned Aircraft Systems , 2010 .

[8]  A. Orsi,et al.  A recount of Ross Sea waters , 2009 .

[9]  Tad McGeer,et al.  Autonomous aerosondes for economical atmospheric soundings anywhere on the globe , 1992 .

[10]  D. Bromwich,et al.  Distribution and characteristics of mesoscale cyclones in the antarctic: Ross Sea eastward to the Weddell Sea , 2003 .

[11]  D. Engelbart,et al.  Generation and atmospheric heat exchange of coastal polynyas in the Weddell Sea , 1992 .

[12]  J. Cassano,et al.  Unmanned aircraft system measurements of the atmospheric boundary layer over Terra Nova Bay, Antarctica , 2012 .

[13]  Giorgio Budillon,et al.  An optimum multiparameter mixing analysis of the shelf waters in the Ross Sea , 2003, Antarctic Science.

[14]  Philippe Ciais,et al.  Inverse modeling of annual atmospheric CO2 sources and sinks , 1999 .

[15]  A. Tarantola.  Inverse problem theory : methods for data fitting and model parameter estimation , 1987 .

[16]  D. Bromwich.  An Extraordinary Katabatic Wind Regime at Terra Nova Bay, Antarctica , 1989 .