The Longgang volcanic field contains climate records that have been used to reconstruct the former climate of the region, both in the form of deposits in lakes and in peatlands. Some of these records may go back over 12,000 years. Fluctuations of the strength of the winter and summer monsoons have been reconstructed from the peatlands. Two cold periods may coincide with two stages of Heinrich event 1 over 10,000 years ago. During the Medieval Climate Anomaly the climate was moister than during the Little Ice Age. Past environmental changes, such as peat growth and red tides in lakes, also leave records.
