<div><pre>
<b>PI:</b> Frank Hoge
<b>of:</b> NASA/Goddard Space Flight Ctr., Wallops Island, VA
<b>dataset:</b> Aircraft observed sea surface temperature and chlorophyll
<b>dates:</b> May 21, 1989
<b>location:</b> N: 63.872 S: 51.6826 W: -22.7278 E: -9.1751
<b>project/cruise:</b> NABE/NASA P3 flight of May 21, 1989
<b>ship:</b> NASA P3 aircraft
<b><a href="/objectserver/de6f56ef791bbf7c7fd4da7e9826e2f8/P3_SST_chl.gif?url=http%3A%2F%2Fusjgofs.whoi.edu%2Fnabe-docs%2FP3_SST_chl.gif&f=3861326262616532313033333337383236386663623634336533363638653034687474703a2f2f75736a676f66732e77686f692e6564752f6e6162652d646f63732f50335f5353545f63686c2e676966">Flight track</a></b>
<b>Flight leg notes:</b>
Flight leg 1
Starting Coordinates: 52 36.6 N 09 10.5 W
Ending Coordinates: 52 24.7 N 14 59.7 W
Flight leg 2
Starting Coordinates: 52 18.2 N 15 49.2 W
Ending Coordinates: 52 05.3 N 17 19.3 W
Flight leg 3 not reported
Flight leg 4
Starting Coordinates: 51 40.8 N 20 00.1 W
Ending Coordinates: 55 22.8 N 19 51.6 W
Flight leg 5
Starting Coordinates: 55 42.3 N 19 59.8 W
Ending Coordinates: 59 32.1 N 20 03.5 W
Flight leg 6
Starting Coordinates: 59 32.4 N 20 04.6 W
Ending Coordinates: 59 40.6 N 22 01.3 W
Flight leg 7
Starting Coordinates: 60 01.0 N 22 03.6 W
Ending Coordinates: 63 52.3 N 22 43.7 W
</pre><h2>Airborne<br />
Oceanographic Lidar (AOL) data description</h2>
<p><br /><br /><br /><br /><b>for the JGOFS North Atlantic Bloom Experiment (NABE)</b> <br /><br />
21 May 1989 Frank Hoge<br /><br />
NASA/Goddard Space Flight Ctr., Wallops Island, VA<br /><br /><br /></p>
<p> The laser-induced chlorophyll fluorescence has been normalized by the water<br />
Raman backscatter to correct for variations in the optical attenuation properties<br />
of the upper water column along the flight track. A discussion of the AOL<br />
instrumentation and the water Raman normalization procedure are given in<br />
the references listed below. The laser-induced chlorophyll fluorescence<br />
was acquired using 532 nm excitation from a frequency doubled Nd:YAG laser<br />
with an output power of ~15 mjoule/pulse. The laser was operated at 10 pulses/second.<br />
At the nominal 120 m/sec velocity of the NASA P-3A aircraft, this sampling<br />
rate yields an observation every 1.2 m along the flight track. The data<br />
contained in these files are 30 point simple averages providing an observation<br />
approximately every 0.4 km. The 532 nm laser excitation also stimulates<br />
fluorescence from the phycoerythrin pigment contained in some strains of<br />
marine phytoplankton. The amount of laser-induced phycoerythrin fluorescence<br />
found during the 21 May 1989 survey was found to be low (below the detection<br />
limitation of the AOL sensor) and accordingly is not included with the data<br />
set contained on this disk.<br /><br /><br /><br />
The relationship between water Raman normalized laser-induced chlorophyll<br />
fluorescence ratio and chlorophyll concentration varies somewhat due to<br />
changes in the fluorescence pigment quantum efficiency of the in situ chlorophyll<br />
molecules much as chlorophyll fluorescence from a continuous underway fluorometer<br />
does. Changes in the fluorescence quantum efficiency are affected by such<br />
factors as available light, nutrients, etc., however from previous experiments<br />
we have seldom seen variations in excess of 20% within a single mission<br />
over a period of 4 to 5 hours under daylight conditions. In comparing the<br />
data set with available chlorophyll data from the R/V Discovery (U.K.) over<br />
a contemporaneous span between 52.5 N and 53.5 N (over a period of 9 - 17<br />
hours after the airborne sampling) we found that a scale factor 4.95 applied<br />
to the water Raman normalized laser-induced chlorophyll provided reasonable<br />
agreement. The data set from the R/V Discovery and the Raman normalized<br />
laser-induced chlorophyll fluorescence data from the AOL were resampled<br />
at 0.02 degree increments as a function of latitude and combined. A linear<br />
regression between the absolute chlorophyll values and the chlorophyll fluorescence<br />
yielded an R coefficient of 0.80 and the above 4.95 scale factor between<br />
the Raman normalized laser-induced chlorophyll fluorescence values and chlorophyll<br />
in ug/liter units. The 4.95 scale factor was applied to all data sets obtained<br />
during the May 21 mission. The SST observations were collected from an auxiliary<br />
Barnes PRT-5 infrared radiometer. A linear regression of the PRT-5 ocean<br />
surface temperature values along all 7 flight lines with the ocean surface<br />
temperature values from the Airborne Expendable Bathythermographs (AXBT's)<br />
yielded a r coefficient of 0.95. Note that Leg 3 was not included because<br />
of some instrument problems experienced at that point in the mission. </p>
<hr /><p> <b>References:</b>
</p>
<p> Hoge, F. E., and R. N. Swift, Airborne dual laser excitation and mapping<br />
of phytoplankton photopigments in a Gulf Stream warm core ring, Appl.<br />
Opt. 22, 2272-2281, 1983.
</p>
<p> Smith, R. C., O. B. Brown, F. E. Hoge, K. S. Baker, R. H. Evans, R.<br />
N. Swift, and W. E. Esaias, Multiplatform sampling (ship, aircraft, and<br />
satellite) of a Gulf Stream warm core ring, Appl. Opt. 26, 2068-2081,<br />
1987a.</p></div>
Aircraft observed sea surface temperature and chlorophyll
<div><p>Aircraft observed sea surface temperature and chlorophyll</p></div>
P3_SST_chl
2623
P3_SST_chl
2010-06-16T16:40:39-04:00
2010-06-16T16:40:39-04:00
2023-07-07T16:10:26-04:00
urn:bcodmo:dataset:2623
Aircraft observed sea surface temperature and chlorophyll from NASA P3 aircraft in the North Atlantic in 1989 (U.S. JGOFS NABE project)
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Hoge, F. E. (2002) Aircraft observed sea surface temperature and chlorophyll from NASA P3 aircraft in the North Atlantic in 1989 (U.S. JGOFS NABE project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version February 4, 2002) Version Date 2002-02-04 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/2623 [access date]
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