Members of the Freshwater UmbrellaThe Freshwater Umbrella comprises leading experts in freshwater chemistry, biology, ecology, and environmental statistics, drawn from the foremost UK aquatic science laboratories with a long experience of surface water acidification. The core of the Freshwater Umbrella has developed and undertaken the research programmes that have comprised the Freshwater Umbrella since its inception in 1990, with new members joining as part of the current research programme who are experts in nitrogen isotope analysis (Tim Heaton - BGS Keyworth) and nutrient nitrogen in freshwaters (Stephen Maberly - CEH Lancaster).