Regional estimates of reef carbonate dynamics and productivity using Landsat 7 ETM+, and potential impacts from ocean acidification

Marine Ecology Progress Series

Christopher S. Moses¹  Serge Andr#xe9fou#xebt¹  Christine J. Kranenburg¹  Frank E. Muller-Karger¹ 

关键词: Remote sensing;    Corals;    Carbon cycle;    Millennium Coral Reef Map;   

DOI  :  10.3354/meps07920

学科分类：海洋学与技术

来源: Inter-Research

【 摘 要 】

ABSTRACT: Using imagery at 30 m spatial resolution from the most recent Landsat satellite, the Landsat 7 Enhanced Thematic Mapper Plus (ETM+), we scale up reef metabolic productivity and calcification from local habitat-scale (10^–1 to 10⁰ km²) measurements to regional scales (10³ to 10⁴ km²). Distribution and spatial extent of the North Florida Reef Tract (NFRT) habitats come from supervised classification of the Landsat imagery within independent Landsat-derived Millennium Coral Reef Map geomorphologic classes. This system minimizes the depth range and variability of benthic habitat characteristics found in the area of supervised classification and limits misclassification. Classification of Landsat imagery into 5 biotopes (sand, dense live cover, sparse live cover, seagrass, and sparse seagrass) by geomorphologic class is >73% accurate at regional scales. Based on recently published habitat-scale in situ metabolic measurements, gross production (P = 3.01 × 10⁹ kg C yr^–1), excess production (E = –5.70 × 10⁸ kg C yr^–1), and calcification (G = –1.68 × 10⁶ kg CaCO₃ yr^–1) are estimated over 2711 km² of the NFRT. Simple models suggest sensitivity of these values to ocean acidification, which will increase local dissolution of carbonate sediments. Similar approaches could be applied over large areas with poorly constrained bathymetry or water column properties and minimal metabolic sampling. This tool has potential applications for modeling and monitoring large-scale environmental impacts on reef productivity, such as the influence of ocean acidification on coral reef environments.

【 授权许可】

Unknown