Analyzing long-term water quality of lakes in Rhode Island and the northeastern United States with an anomaly approach.

Chlorophyll a is also showing an increasing trend over time (slope = 0.12, P = 0.000023).

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State-wide trends in water quality Median annual temperature anomalies in lakes and reservoirs appear to be increasing as the slope is greater than the threshold of 0.02 we identified, the P value suggests some statistical support for a positive trend (slope = 0.044, P = 0.065), and the majority of years with median temperature greater than the long-term median are occurring in the second half of the time period ( Fig. 4 ; Table 5 ).

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Using all of this information, we determine that a trend exists if it meets at least 2 of the 3 criteria, a weak trend exists if it meets one of the criteria, and no trend exists if it meets none of the criteria.

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