North Pacific Gyre Oscillation from Observations Reprocessing

Overview

DEFINITION

The North Pacific Gyre Oscillation (NPGO) is a climate pattern introduced by Di Lorenzo et al. (2008) and further reported by Tranchant et al. (2019) in the CMEMS Ocean State Report #3. The NPGO is defined as the second dominant mode of variability of Sea Surface Height (SSH) anomaly and SST anomaly in the Northeast Pacific (25°– 62°N, 180°– 250°E). The spatial and temporal pattern of the NPGO has been deduced over the [1950-2004] period using an empirical orthogonal function (EOF) decomposition on sea level and sea surface temperature fields produced by the Regional Ocean Modeling System (ROMS) (Di Lorenzo et al., 2008; Shchepetkin and McWilliams, 2005). Afterward, the sea level spatial pattern of the NPGO is used/projected with satellite altimeter delayed-time sea level anomalies to calculate and update the NPGO index. The NPGO index disseminated on CMEMS was specifically updated from 2004 onward using up-to-date altimeter products (DT2021 version; SEALEVEL_GLO_PHY_L4_MY _008_047 CMEMS product, including “my” & “myint” datasets, and the near-real time SEALEVEL_GLO_PHY_L4_NRT _008_046 CMEMS product). …

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Documentation

Classification

Full name
North Pacific Gyre Oscillation from Observations Reprocessing
Product ID
OMI_EXTREME_CLIMVAR_PACIFIC_npgo_sla_eof_mode_projection
Source
Satellite observations
Spatial extent
Global OceanLat -90° to 90°Lon 0° to 360°
Temporal extent
Since 15 Jan 1950
Temporal resolution
Monthly
Variables
Tendency of sea surface height above sea level (SSH)
Indicator family
Climate variability
Feature type
timeseries
Blue markets
Science & innovation
Projection
N/A
Update frequency
QuarterlyAnnually
Format
NetCDF-4
Originating centre
CLS (France)
Last metadata update
30 November 2023