Description of time series:
The time series shows the relative sea level for this region. During the last five years there has been a positive trend and while values have remained within the 10th and 90th percentiles, albeit near the higher range of time series values.
Description of gauge:
The gauge value of 87 indicates that the mean sea level between 2013 and 2017 for Northern Alaska was higher than 87% of the sea level between 1998 and 2017.
Description of Sea Level:
Sea level varies due to the force of gravity, the Earth’s rotation and irregular features on the ocean floor. Other forces affecting sea levels include temperature, wind, ocean currents, tides, etc. With 40 percent of Americans living in densely populated coastal areas, having a clear understanding of sea level trends is critical to societal and economic well being.
Measuring and predicting sea levels, tides and storm surge are important for determining coastal boundaries, ensuring safe shipping, and emergency preparedness, etc. NOAA monitors sea levels using tide stations and satellite laser altimeters. Tide stations around the globe tell us what is happening at local levels, while satellite measurements provide us with the average height of the entire ocean. Taken together, data from these sources are fed into models that tell us how our ocean sea levels are changing over time. For this site, data from tide stations around the US were combined to create regionally averaged records of sea-level change since 1980. We present data for all regions.
Source: https://tidesandcurrents.noaa.gov/stations.html?type=Water+Levels These data are measurements of relative sea level from NOAA tide gauges that have >20 years of hourly data. These local measurements are regionally averaged by taking the median value of all the qualifying stations within a region. The measurements are in meters and are relative to the year 2000.