השוואת שיטות

	שבועות חום מצטבר	ניתוח לגראנז'יאני של מצופים
תחום	אוקיינוגרפיה	אוקיינוגרפיה
משפחה	Process / pipeline	Process / pipeline
שנת המקור	2003	1985
הוגה השיטה	NOAA Coral Reef Watch	Robert Davis
סוג	thermal-metric	instrumental
מקור מכונן	Liu, G., Strong, A. E., & Skirving, W. (2003). Remote sensing of sea surface temperatures during 2002 Great Barrier Reef coral bleaching. EOS Transactions, 84(15), 137-141.	Davis, R. E. (1985). Drifter observations of coastal surface currents during CODE: The method and descriptive view. Journal of Geophysical Research, 90(C3), 4741-4755.
כינויים	DHW, Thermal Stress Index	Lagrangian Tracking, Drifter Analysis
קשורות	3	3
תקציר	Degree Heating Weeks (DHW) is a thermal stress metric that quantifies accumulated heat exposure above a coral bleaching threshold, computed from satellite sea surface temperature data. Developed by NOAA's Coral Reef Watch program in 2003, DHW provides a standardized index for predicting and monitoring coral bleaching stress globally. The metric combines intensity and duration of thermal anomalies to estimate cumulative physiological stress on coral colonies.	Drifter Lagrangian analysis tracks the motion of water parcels using surface drifters (buoys with attached drogues) to measure ocean currents directly. Developed by Robert Davis in the 1980s, this method provides direct observation of water parcel trajectories and enables estimation of eddy diffusivity, transport pathways, and mixing. Drifter data complement Eulerian (fixed-point) observations by capturing the Lagrangian perspective of fluid motion.