Linear split trends of relative mean sea level at CO-OPS tide gauges

Zervas, Chris; Wolcott, David; Callahan, John; Armos, Bailey; Dusek, Greg

doi:10.25923/s84e-6w11

i

Linear split trends of relative mean sea level at CO-OPS tide gauges

2025
By Zervas, Chris ; Wolcott, David ; Callahan, John ; ...
Series: NOAA technical memorandum NOS CO-OPS 115

Details

Personal Author:

Zervas, Chris ; Wolcott, David ; Callahan, John ; Armos, Bailey ; Dusek, Greg
Corporate Authors:

Center for Operational Oceanographic Products and Services (U.S.) ; Ocean Associates, Inc. ; IBSS Corporation.
NOAA Program & Office:

NOS (National Ocean Service) ; CO-OPS (Center for Operational Oceanographic Products & Services)
Description:

This memo outlines an expansion to the CO-OPS linear trend approach to more accurately capture changing RSL conditions. The new approach uses a split-trend method to fit two distinct linear trend segments joined at a breakpoint of 1993. The new approach was proposed for the following reasons: 1) it better reflects RSL change over the recent past than a single linear trend, 2) it enables comparing recent RSL change to historical change, 3) it provides a common baseline to compare against other U.S. stations within and across geographic regions, and 4) it provides a more direct comparison to ocean observations from satellite altimetry, which begin in 1993. Coinciding with the adoption of the split trend approach, CO-OPS also modified its 50-year trend plots to use 30-year intervals instead and to be applied at gauges with at least 40 years of historical record.
Keywords:

Climatology Coastal Hazard Coastal Water Levels Historical Observations Interannual Variability Mean Sea Level NWLON Oceanographic Data Sea Level Sea Level Rise Tide Gauges Time Series Analysis Trends Vertical Land Motion
Series:

NOAA technical memorandum NOS CO-OPS 115
DOI:

https://doi.org/10.25923/s84e-6w11
Format:

pdf
Document Type:

Technical Memorandum
License:

https://creativecommons.org/publicdomain/zero/1.0/
Rights Information:

CC0 Public Domain
Compliance:

Submitted
Main Document Checksum:

urn:sha-512:c96b4f1d1c3f8778f43c849b5b404eced42f0192ea9b4490d40b4a9d39611439c98c50f65e247ee38a2257790b81b829edaeda6600f91d5211d05bfc7d468057
Download URL:

https://repository.library.noaa.gov/view/noaa/71361/noaa_71361_DS1.pdf
File Type:

[PDF - 5.30 MB ]

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