In October 2020, Mexico’s Yucatan Peninsula was doused by three storms: Gamma, Delta, and Eta. The storms came just months after tropical storm Cristobal delivered more than 50 centimeters (20 inches) of rainfall to the region in June. The accumulated rainfall and powerful winds significantly damaged mangrove forests in the region.
Scientists from NASA, Wageningen University, and Federal University of Viçosa have been assessing the damage in Central America using satellite data. A team based in the state of Yucatan also caught the action closer to the ground, using drones to capture mangrove changes before and after the 2020 hurricane season.
All photos are provided by Jorge Herrera from the Center for Research and Advanced Studies of the National Polytechnic Institute (CINVESTAV) and his team.
Dzilam el Bravo
The October storms brought powerful winds that uprooted and defoliated mangrove forests near the coastal city of Dzilam el Bravo, located on the northern tip of the Yucatan Peninsula. The images below show changes from 2019 (top) to October 2020 (bottom), after Delta recently passed through the region.
The storms also brought major flooding to other Yucatan regions. Extreme precipitation can affect oxygen concentrations in soils and hinder photosynthesis for mangroves. Large storm surges can also cause physical damage and uproot trees. The images below show a mangrove near the city of Progreso in September 2020 (top image) and in November 2020 (bottom), after suffering from severe flooding.
The images below show an area near the Yucalpetén port, a few kilometers west of Progreso. Note the difference in defoliated trees from 2019 (top image) and in 2020 (bottom). In addition to defoliation, mangrove damage can also include the loss of seedlings, roots, and woody material.
The team will continue monitoring these and other sites for at least the next two years as they study mangrove regrowth and recovery through the COastal biodiversity RESilience to increasing extreme events in Central America (CORESCAM) project.