Laidre, Kristin L; Heide-Jørgensen, Mads Peter; Logsdon, Miles L; Delwiche, Leon; Nielsen, Torkel Gissel (2010): Chlorophyll a concentration, and proportion of time in the water column obtained by instrumented bowhead whales [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.815106, Supplement to: Laidre, KL et al. (2010): A whale of an opportunity: Examining the vertical structure of chlorophyll-a in high Arctic waters using instrumented marine predators. Marine Biology Research, 6(6), 519-529, https://doi.org/10.1080/17451000903505616
Always quote citation above when using data! You can download the citation in several formats below.
Abstract:
Sixty hours of direct measurements of fluorescence were collected from six bowhead whales (Balaena mysticetus) instrumented with fluorometers in Greenland in April 2005 and 2006. The data were used to (1) characterize the three-dimensional spatial pattern of chlorophyll-a (Chl-a) in the water column, (2) to examine the relationships between whale foraging areas and productive zones, and (3) to examine the correlation between whale-derived in situ values of Chl-a and those from concurrent satellite images using the NASA MODIS (Moderate Resolution Imaging Spectroradiometer) EOS-AQUA satellite (MOD21, SeaWifs analogue OC3M and SST MOD37). Bowhead whales traversed 1600 km**2, providing information on diving, Chl-a structure and temperature profiles to depths below 200 m. Feeding dives frequently passed through surface waters ( >50 m) and targeted depths close to the bottom, and whales did not always target patches of high concentrations of Chl-a in the upper 50 m. Five satellite images were available within the periods whales carried fluorometers. Whales traversed 91 pixels collecting on average 761 s (SD 826) of Chl-a samples per pixel (0-136 m). The depth of the Chl-a maximum ranged widely, from 1 to 66 m. Estimates of Chl-a made from the water-leaving radiance measurements using the OC3M algorithm were highly skewed with most samples estimated as <1 mg/m**3 Chl-a, while data collected from whales had a broad distribution with Chl-a reaching >9 mg/m**3. The correlation between the satellite-derived and whale-derived Chl-a maxima was poor, a linear fit explained only 10% of the variance.
Project(s):
Coverage:
Latitude: 69.209000 * Longitude: -53.556000
Date/Time Start: 2005-04-22T13:56:00 * Date/Time End: 2006-05-01T18:55:00
Event(s):
Comment:
Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
Download Data
Datasets listed in this publication series
- Laidre, KL; Heide-Jørgensen, MP; Logsdon, ML et al. (2010): (Table 1) Chlorophyll a maximum in Disko Bay, West Greenland, measured by instrumented bowhead whales (Balaena mysticetus). https://doi.org/10.1594/PANGAEA.815104
- Laidre, KL; Heide-Jørgensen, MP; Logsdon, ML et al. (2010): (Table 2) Proportion of time of bowhead whales (Balaena mysticetus) spent in 10 m bins of the water column in Disko Bay. https://doi.org/10.1594/PANGAEA.815105