Lesson 32 Mineral Cycling - Alaska Geobotany Center
Lesson 32 Mineral Cycling - Alaska Geobotany Center
Lesson 32 Mineral Cycling - Alaska Geobotany Center
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Acid rain at<br />
Hubbard Brook<br />
• Precipitation chemistry has been monitored<br />
since the late 1960s, when scientists noticed the<br />
unusually low pH, between 4.0 and 4.2 (5.6 is<br />
normal for rain).<br />
• Since 1965 rain water has been collected in<br />
containers which are located throughout the<br />
watersheds. The samples are collected weekly<br />
and brought back to the lab where pH values<br />
are measured and then entered into the longterm<br />
database.<br />
• Although pH has been rising steadily since the<br />
Clean Air Act was passed in 1970, the<br />
precipitation is still quite acid, and has effects on<br />
other components of the ecosystem, such as<br />
calcium levels.<br />
Courtesy of Hubbard Brook web page: www.hubbardbrook.org/education/SubjectPages/AcidRainPage.htm
Change language