Index of /ftp/oceans/VOS_Palmer_Lines/Palmer_1999

[ICO]NameLast modifiedSizeDescription

[DIR]Parent Directory  -  
[   ]PALM_99_09_data_report.pdf21-Nov-2011 19:24 147K 
[TXT]PALM_1999_All_Updated.csv31-Mar-2016 18:00 4.1M 
[DIR]Palmer_1999_Old/21-Jan-2016 17:57 -  
[   ]Palmer_PCO2_man_1_2.pdf21-Nov-2011 22:05 340K 
[   ]Palmer_methods.pdf21-Nov-2011 19:14 152K 
[TXT]README21-Jan-2016 17:58 2.5K 
[   ]Updates_description.pdf12-Nov-2015 20:36 36K 

NOTE!!! Please, do not use the data in Palmer_1999_Old directory for new research and
publications, use PALM_1999_All_Updated.csv data file!

Please cite this data set as:

Takahashi, T., C. Sweeney and S. C. Sutherland. 2011. Underway pCO2 Measurements 
in Surface Waters and the Atmosphere During the R/V Nathaniel B. Palmer 1999 Expeditions. Carbon Dioxide Information 
Analysis Center, Oak Ridge National Laboratory, US Department of Energy, Oak Ridge, Tennessee. 
doi: 10.3334/CDIAC/OTG.VOS_PALMER_1999 

NOTE: Original LDEO data files for all cruises were updated on 01/12/2016 as follows:

These files have been reprocessed during the spring of 2015 in order to account for the
time lag of water from the ship’s intake to the pCO2 system. The timing of the seawater
temperature data measured with ThermoSalinoGraph (TSG) unit was adjusted to match the 
timing of input temperature (Teq) of the pCO2 equilibrator. The time lag of be 3 or 6 
minutes was applied depending upon cruises. The corrections applied to corresponding pCO2 
data points are up to about ±8 μatm for the Palmer and Gould data and ±16 μatm for the 
Healy data, while the mean of the corrections for each cruise is less than ± 1 μatm.

When the TSG (Thermosalinograph) temperature was judged unreliable, equilbrator 
temperature was used to estimate SST by applying a constant off-set estimated using the 
data from other legs. Therefore, the time-lag correction is not necessary.

As to atmospheric CO2 measurements, with the surface pCO2 observations, we have chosen to 
reject air observations from these ships. It is not possible to accurately determine 
amount of CO2 contamination from local sources including the ships exhaust systems, even 
with the benefit of wind data. Severe CO2 spikes were found during a nearly head-on 
relative wind conditions, suggesting local source of contamination.

With the benefit of 10 plus years of observations, editing, and analysis of surface water 
pCO2, we consider that the running mean is not a satisfactory criterion for rejecting 
“outliers.” Often large and rapid changes occur naturally in open ocean systems due to 
patchiness of biological activities as well as to hydrodynamic conditions including 
eddies, meandering of currents, local weather: yet these observations are valid and should 
not be deleted. We, therefore, hand edit the data taking the coherence of pCO2 values with 
other measured variables into consideration.