File: cruise_met.mat  

Contents: Basic 1-m underway ship-board meteorological and sea surface
	  temperature, salinity, and fluorense data collected on
	  LMG02-1A for the southern leg between Palmer Station (PS) and
	  Palmer Station. Also included are estimates of the surface
	  wind stress and heat flux, both 1-m and 1-hr averaged series. 

Date: March 1, 2002 

Source: lmg_met1m.mat

Processing: 1. Data begins when LMG leaves PS and stops as LMG enters
	       PS. One 41-min gap in most of the variables was filled
	       using linear interpolation.

            2. The raw 1-min short-wave radiation data (sw) has a large
	       negative offset during night. This bias appears to get
	       larger during the cruise. This bias was removed using
	       linear interpolation between the lowest sw value before
	       sunrise and the lowest sw value after sunset. The "night-
	       time" values were set to zero.  The 41 min gap in the new
	       sw series (swn) was filled with linear interpolation
	       (swnf), then used to compute sw heat flux (with the few
	       negative values left in swnf set to zero prior to the
	       calculation).

            3. The 1-min wind stress and heat flux series were computed
	       using lmg_wshf1m.m.  Thses 1-min series were then used to
	       make 1-hr average time series, using qneta=
	       boxave(qnet,19,60) (so that the hour average is centered
	       on the hour).

	    4. All series should be considered preliminary, since the
	       JGOFS wind may differ from the "true" wind (which will be
	       calculated later from the raw met and nav data), and the
	       questions of the accuracy of the sw sensor and data.

Sample rate: 1 min, 1 hr

Start time:   February 11, 2002    19:13:00 GMT  (1-min data)
Stop time:    February 26, 2002    09:36:00 GMT  (1-min data)

Start time:   February 11, 2002    20:00:30 GMT  (1-hr data)
Stop time:    February 26, 2002    09:00:30 GMT  (1-hr data)

  
******* TIME SERIES *************************************************                   
  
1-min data

  x - longitude (deg E)
  y - latitude (deg N)
  t - 2002 yearday (00Z Jan 1 = 1)
 
  sst - sea temp (oC) 
  sss - sea surface salinity (PSU) 
  fluor - fluorescence (V) 
  
  at - air temp (oC) 
  bp - barometric pressure (mbars)
  rh - relative humidity (%) 
  ws - wind spreed (m/s)
  wd - wind direction (ocean convention) (deg wrt E)
  par - par (mEi/m^2s)
  sw - raw incident shortwave radiation (W/m^2)
  swn - sw with night-time bias removed
  swnf - sw with night-time bias removed and 41-min gap filled
  swnp - sw predicted using linear regression with par
  lw - incident longwave radiation (W/m^2)
  
  stress - wind stress magitude  (N/m^2)
  tx,ty - east, north wind stress
  qnet - net HF  (W/m^2)
  qsw - shortwave HF
  qlw - longwave HF
  qsen - sensible HF
  qlat - latent HF
  sorad - no sky sw radiation
  sunalt - sun altitude
  
1-hr data

  ta - 2002 yearday
  stressa - wind stress magitude  (N/m^2)
  wda - wind (and wind stress) direction
  txa,tya - east, north wind stress
  qneta - net HF  (W/m^2)
  qswa - shortwave HF
  qlwa - longwave HF
  qsena - sensible HF
  qlata - latent HF
  
  
  
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