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Mind the gap: The impact of missing data on the calculation of phytoplankton phenology metrics

Mind the gap: The impact of missing data on the calculation of phytoplankton phenology metrics
Mind the gap: The impact of missing data on the calculation of phytoplankton phenology metrics
Annual phytoplankton blooms are key events in marine ecosystems and interannual variability in bloom timing has important implications for carbon export and the marine food web. The degree of match or mismatch between the timing of phytoplankton and zooplankton annual cycles may impact larval survival with knock-on effects at higher trophic levels. Interannual variability in phytoplankton bloom timing may also be used to monitor changes in the pelagic ecosystem that are either naturally or anthropogenically forced. Seasonality metrics that use satellite ocean color data have been developed to quantify the timing of phenological events which allow for objective comparisons between different regions and over long periods of time. However, satellite data sets are subject to frequent gaps due to clouds and atmospheric aerosols, or persistent data gaps in winter due to low sun angle. Here we quantify the impact of these gaps on determining the start and peak timing of phytoplankton blooms. We use the NASA Ocean Biogeochemical Model that assimilates SeaWiFS data as a gap-free time series and derive an empirical relationship between the percentage of missing data and error in the phenology metric. Applied globally, we find that the majority of subpolar regions have typical errors of 30 days for the bloom initiation date and 15 days for the peak date. The errors introduced by intermittent data must be taken into account in phenological studies.
0148-0227
C08030
Cole, Harriet
7e6479d0-4450-483c-a723-20f5e99fa515
Henson, Stephanie
d6532e17-a65b-4d7b-9ee3-755ecb565c19
Martin, Adrian
9d0d480d-9b3c-44c2-aafe-bb980ed98a6d
Yool, Andrew
882aeb0d-dda0-405e-844c-65b68cce5017
Cole, Harriet
7e6479d0-4450-483c-a723-20f5e99fa515
Henson, Stephanie
d6532e17-a65b-4d7b-9ee3-755ecb565c19
Martin, Adrian
9d0d480d-9b3c-44c2-aafe-bb980ed98a6d
Yool, Andrew
882aeb0d-dda0-405e-844c-65b68cce5017

Cole, Harriet, Henson, Stephanie, Martin, Adrian and Yool, Andrew (2012) Mind the gap: The impact of missing data on the calculation of phytoplankton phenology metrics. Journal of Geophysical Research, 117 (C8), C08030. (doi:10.1029/2012jc008249).

Record type: Article

Abstract

Annual phytoplankton blooms are key events in marine ecosystems and interannual variability in bloom timing has important implications for carbon export and the marine food web. The degree of match or mismatch between the timing of phytoplankton and zooplankton annual cycles may impact larval survival with knock-on effects at higher trophic levels. Interannual variability in phytoplankton bloom timing may also be used to monitor changes in the pelagic ecosystem that are either naturally or anthropogenically forced. Seasonality metrics that use satellite ocean color data have been developed to quantify the timing of phenological events which allow for objective comparisons between different regions and over long periods of time. However, satellite data sets are subject to frequent gaps due to clouds and atmospheric aerosols, or persistent data gaps in winter due to low sun angle. Here we quantify the impact of these gaps on determining the start and peak timing of phytoplankton blooms. We use the NASA Ocean Biogeochemical Model that assimilates SeaWiFS data as a gap-free time series and derive an empirical relationship between the percentage of missing data and error in the phenology metric. Applied globally, we find that the majority of subpolar regions have typical errors of 30 days for the bloom initiation date and 15 days for the peak date. The errors introduced by intermittent data must be taken into account in phenological studies.

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Published date: 2012
Organisations: Marine Biogeochemistry, Ocean Biochemistry & Ecosystems

Identifiers

Local EPrints ID: 342419
URI: https://eprints.soton.ac.uk/id/eprint/342419
ISSN: 0148-0227
PURE UUID: 3a5be8c8-e105-4a10-aa7c-f9f57a64bfe6

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Date deposited: 29 Aug 2012 12:18
Last modified: 16 Jul 2019 21:55

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Contributors

Author: Harriet Cole
Author: Adrian Martin
Author: Andrew Yool

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