I have worked as a freelance writer and photographer since 1970. I also design, build and use a variety of atmospheric monitoring instruments and have consulted or performed field work for NOAA, NASA (GSFC and LaRC), National Geographic Society, EPA, USDA (through Colorado State University), GLOBE, TERC and the Concord Consortium.
“Hawaii’s Mauna Loa Observatory: Fifty Years of Monitoring the Atmosphere” (University of Hawaii Press, 1912) is available from Amazon and http://www.uhpress.hawaii.edu/books.aspx
The photo above shows the rings of a century old baldcypress (Taxodium distichum) that stood on the bank of the Guadalupe River in Central Texas until downed by a major flood in 2002. The rings clearly show the impact of the drought of 1954-56.
The header photo is a collage of five sunset images of the antitwilight glow made by a Phantom 4 UAV hovering at 33 meters. The pink arc suggests a very clean sky. The dark region under the arc is Earth’s shadow.