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129366 - Chlorophyll a in Antarctic landfast sea ice, a first synthesis of historical ice core data.pdf (1.85 MB)

Chlorophyll-a in Antarctic landfast sea ice: a first synthesis of historical ice core data

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posted on 2023-05-19, 22:45 authored by Klaus MeinersKlaus Meiners, Vancoppenolle, M, Carnat, G, Castellani, G, Delille, B, Delille, D, Dieckmann, GS, Flores, H, Fripiat, F, Grotti, M, Lange, BA, Delphine LannuzelDelphine Lannuzel, Martin, A, Andrew McMinnAndrew McMinn, Nomura, D, Peeken, I, Rivaro, P, Ryan, KG, Stefels, J, Kerrie SwadlingKerrie Swadling, Thomas, DN, Tison, J-L, Pier van der MerwePier van der Merwe, van Leeuwe, MA, Christine Weldrick, Yang, EJ

Historical sea ice core chlorophyll‐a (Chla) data are used to describe the seasonal, regional, and vertical distribution of ice algal biomass in Antarctic landfast sea ice. The analyses are based on the Antarctic Fast Ice Algae Chlorophyll‐a data set, a compilation of currently available sea ice Chla data from landfast sea ice cores collected at circum‐Antarctic nearshore locations between 1970 and 2015. Ice cores were typically sampled from thermodynamically grown first‐year ice and have thin snow depths (mean = 0.052 ± 0.097 m). The data set comprises 888 ice cores, including 404 full vertical profile cores. Integrated ice algal Chla biomass (range: <0.1–219.9 mg/m2, median = 4.4 mg/m2, interquartile range = 9.9 mg/m2) peaks in late spring and shows elevated levels in autumn. The seasonal Chla development is consistent with the current understanding of physical drivers of ice algal biomass, including the seasonal cycle of irradiance and surface temperatures driving landfast sea ice growth and melt. Landfast ice regions with reported platelet ice formation show maximum ice algal biomass. Ice algal communities in the lowermost third of the ice cores dominate integrated Chla concentrations during most of the year, but internal and surface communities are important, particularly in winter. Through comparison of biomass estimates based on different sea ice sampling strategies, that is, analysis of full cores versus bottom‐ice section sampling, we identify biases in common sampling approaches and provide recommendations for future survey programs: for example, the need to sample fast ice over its entire thickness and to measure auxiliary physicochemical parameters.

History

Publication title

Journal of Geophysical Research: Oceans

Volume

123

Issue

11

Pagination

8444-8459

ISSN

2169-9275

Department/School

Institute for Marine and Antarctic Studies

Publisher

Wiley-Blackwell Publishing, Inc.

Place of publication

United States

Rights statement

Copyright 2018 American Geophysical Union

Repository Status

  • Restricted

Socio-economic Objectives

Ecosystem adaptation to climate change

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