Collocated Data for the R/V Knorr Data Sets

[an error occurred while processing this directive] Collocated Data for the R/V Knorr Data Sets

Collocated Data for Research Vessel Data Sets

The data are stored in an ASCII format.

Column Number	Variable	HDF Variable	Units	Data Type	Declaration
Column Number	Variable	HDF Variable	Units	Data Type	IDL	C	FORTRAN
0	QuikSCAT latitude	wvc_lat	degrees	scalar	float	float	real
1	QuikSCAT longitude	wvc_lon	degrees	scalar	float	float	real
2	QuikSCAT observation time, relative to 0Z, 1 Jan. 1980	wvc_row_time	minutes	scalar	long	int	integer
3	Ship latitude		degrees	scalar	float	float	real
4	Ship longitude		degrees	scalar	float	float	real
5	Ship observation time, relative to 0Z, 1 Jan. 1980		minutes	scalar	long	int	integer
6	Spatial difference		km	scalar	float	float	real
7	Temporal difference		minutes	scalar	float	float	real
8	QuikSCAT wind speed	wind_speed	m/s	scalar	float	float	real
9	QuikSCAT wind direction	wind_dir	degrees	scalar	integer	short	integer*2
10	Cell location	wvc_index	NA	scalar	long	int	integer
11	Ship equivalent neutral true wind speed, adjusted to a height of 10 m		m/s	scalar	float	float	real
12	Ship true wind direction		degrees	scalar	long	long	integer
13	Ship true wind speed, at observation height		m/s	scalar	float	float	real
14	Air temperature at observation height		^oC	scalar	float	float	real
15	Sea temperature at observation depth		^oC	scalar	float	float	real
16	Relative Humidity at observation height		g/kg	scalar	float	float	real

Definitions:

True wind	Wind speed relative to the fixed earth, and direction relative to true North. Following meteorological convention, the wind is considered to move towards the specified direction.
Apparent wind	Wind speed relative to the ship's mean motion, and direction relative to the ship's bow. Following meteorological convention, the wind is considered to move towards the specified direction.
Equivalent neutral wind speed	Type of wind speed that scatterometers appear to measure. Warning, equivalent neutral winds are NOT EQUIVALENT to neutral winds (Tang and Liu, 1996; Verschell et al., 1999). For more detailed information see the associated web pages.
Height adjusted	Wind speeds modified from that at the observed height to a conventional height. In this case, the height to which the scatterometer is calibrated: 10m.

Missing Data:

Missing data is set to a value of -9999 or -9999.0.

References:

Bourassa, M. A., D. G. Vincent, and W. L. Wood, A flux parameterization including the effects of capillary waves and sea state. J. Atmos. Sci., 56, 1123-1139.

Tang, W., and W. T. Liu, Equivalent Neutral Wind, JPL Publication 96-17, 1996.

Verschell, M. A., M. A. Bourassa, D. E. Weissman, and J. J. O'Brien, Model validation of the NASA scatterometer winds, J. Geophys. Res., 104, 11,359-11,374, 1999

Last Updated 18 October, 1999