Dataset: ESA Sea Level Climate Change Initiative (Sea_Level_cci): Altimeter along-track high resolution sea level anomalies in some coastal regions (2002-2018) from the JASON satellites, v1.1#

Dataset identifier: esacci.SEALEVEL.10-days.L3.SLA.multi-sensor.multi-platform.N_INDIAN.1-1.r1
Data store: cciodp

How to open this dataset in AVL JupyterLab  

cciodp_store = new_data_store('cciodp')
ds = cciodp_store.open_data('esacci.SEALEVEL.10-days.L3.SLA.multi-sensor.multi-platform.N_INDIAN.1-1.r1')

Bounding box map#

Bounding box map
Map tiles and data from OpenStreetMap, under the ODbL.

Basic information#

Parameter Value
Bounding box longitude (°) -30.0 to 160.0
Bounding box latitude (°) -45.0 to 60.0
Time range 2002-01-01 to 2019-12-31
Time period 10D

Click here for full dataset metadata.

Variable list#

Click on a variable name to jump to the variable’s full metadata.

Variable Long name Units
qual_flag 20Hz SLA quality flag [none]
biasJ1J2 J1 J2 intermission bias m
biasJ2J3 J2 J3 intermission bias m
cycle Cycle number count
dist_to_coast_gshhs Distance to nearest coastline m
mdt_cnes_cls_09 Mean Dynamic Topography m
missions_cycles Original cycle numbers of the concatenated missions count
sla X-TRACK/ALES Sea Level Anomalies m
ocean_tide Global FES14 tide correction m
dynamic_atmospheric_correction Global Dynamic Atmospheric Corrections m
mean_sea_surface X-TRACK/ALES Mean Sea Surface m

Full variable metadata#

qual_flag#

Field Value
_Unsigned false
comment flag if distance to the coast is lower than 4 km
flag_meanings good, bad
flag_values 0, 1
long_name 20Hz SLA quality flag
orig_data_type uint8
fill_value 65535
size 8199
shape 8199
chunk_sizes 8199
file_chunk_sizes 8199
data_type uint16
dimensions nbpoints
file_dimensions nbpoints

biasJ1J2#

Field Value
units m
long_name J1 J2 intermission bias
comment J1 J2 regional intermission bias - 1°x1° box average. Mean regional value is -0.054 m
orig_data_type float64
fill_value 9.969209968386869e+36
size 8199
shape 8199
chunk_sizes 8199
file_chunk_sizes 8199
data_type float64
dimensions nbpoints
file_dimensions nbpoints

biasJ2J3#

Field Value
units m
long_name J2 J3 intermission bias
comment J2 J3 regional intermission bias - 1°x1° box average. Mean regional value is -0.036 m
orig_data_type float64
fill_value 9.969209968386869e+36
size 8199
shape 8199
chunk_sizes 8199
file_chunk_sizes 8199
data_type float64
dimensions nbpoints
file_dimensions nbpoints

cycle#

Field Value
long_name Cycle number
cyc_min 1
cyc_max 603
units count
orig_data_type int32
fill_value 9223372036854775807
size 603
shape 603
chunk_sizes 603
file_chunk_sizes 603
data_type int64
dimensions nbcycles
file_dimensions nbcycles

dist_to_coast_gshhs#

Field Value
long_name Distance to nearest coastline
actual_range -269448768.0, 251344672.0
units m
description Geodesic distances on WGS-84
GMT_version 4.5.9_r9889 [64-bit]
add_offset 0.0
scale_factor -0.01
comment Distance to nearest GSHHS 1.3 coastline in m
orig_data_type int32
fill_value -2147483648
size 8199
shape 8199
chunk_sizes 8199
file_chunk_sizes 8199
data_type int32
dimensions nbpoints
file_dimensions nbpoints

mdt_cnes_cls_09#

Field Value
long_name Mean Dynamic Topography
units m
FileType GRID_DOTS
OriginalName MDT_CNES-CLS09_v1.1.nc
CreatedBy rio@px-124.cls.fr
CreatedOn 11-MAR-2010 16:50:55:000000
comment MDT CNES-CLS09 V1.1
ctoh_edit_date 2019-12-19 12:34
orig_data_type float64
fill_value 1.8446744073709552e+19
size 8199
shape 8199
chunk_sizes 8199
file_chunk_sizes 8199
data_type float64
dimensions nbpoints
file_dimensions nbpoints

missions_cycles#

Field Value
long_name Original cycle numbers of the concatenated missions
cyc_min 1
cyc_max 303
units count
comment This cycle number is specific to each mission. It is discontinuous on the date of the change of mission.
orig_data_type int16
fill_value -99
size 603
shape 603
chunk_sizes 603
file_chunk_sizes 603
data_type int16
dimensions nbcycles
file_dimensions nbcycles

sla#

Field Value
units m
short_name SLA
add_offset 0.0
scale_factor 1.0
comment sla = altitude of satellite - 20 Hz Ku band ALES corrected altimeter range (Passaro et al. 2014) - altimeter ionospheric correction on Ku band (From dual-frequency altimeter range measurements) - model dry tropospheric correction (From ECMWF model) - GPD+ wet tropospheric correction (Fernandes et al. 2015) - sea state bias correction in Ku band (ALES retracking, Passaro et al. 2014) - solid earth tide height (From RADS, tide potential model, Cartwright and Taylor 1971, Cartwright and Eden 1973) - geocentric ocean tide (FES 2014 from RADS, Carrere et al. 2012) - geocentric pole tide height (Wahr 1985) - Atmospheric correction (From RADS, Carrere and Lyard 2003) - X-TRACK mean sea surface (Birol et al. 2017). Each corrective term is edited following Birol et al. 2017.
long_name X-TRACK/ALES Sea Level Anomalies
standard_name sea_surface_height_above_mean_sea_level
orig_data_type float32
fill_value 99.9999
size 4943997
shape 8199, 603
chunk_sizes 8199, 603
file_chunk_sizes 8199, 603
data_type float32
dimensions nbpoints, nbcycles
file_dimensions nbpoints, nbcycles

ocean_tide#

Field Value
units m
short_name Tide
add_offset 0.0
scale_factor 1.0
long_name Global FES14 tide correction
comment Geocentric ocean tide Includes the corresponding loading tide and equilibrium long-period ocean tide height
standard_name sea_surface_height_amplitude_due_to_geocentric_ocean_tide
orig_data_type float32
fill_value 99.9999
size 4943997
shape 8199, 603
chunk_sizes 8199, 603
file_chunk_sizes 8199, 603
data_type float32
dimensions nbpoints, nbcycles
file_dimensions nbpoints, nbcycles

dynamic_atmospheric_correction#

Field Value
units m
long_name Global Dynamic Atmospheric Corrections
short_name DAC
add_offset 0.0
scale_factor 1.0
comment Combined low and high frequency effect of atmospheric pressure and wind on sea surface height from MOG2D-G
orig_data_type float32
fill_value 99.9999
size 4943997
shape 8199, 603
chunk_sizes 8199, 603
file_chunk_sizes 8199, 603
data_type float32
dimensions nbpoints, nbcycles
file_dimensions nbpoints, nbcycles

mean_sea_surface#

Field Value
units m
short_name MSSH
mssh_period Cycles from 1 to 591 are used for the mssh computation
add_offset 0.0
scale_factor 1.0
long_name X-TRACK/ALES Mean Sea Surface
orig_data_type float32
fill_value 99.9999
size 8199
shape 8199
chunk_sizes 8199
file_chunk_sizes 8199
data_type float32
dimensions nbpoints
file_dimensions nbpoints

Full dataset metadata#

Field Value
title ESA Sea Level Climate Change Initiative (Sea_Level_cci): Altimeter along-track high resolution sea level anomalies in some coastal regions (2002-2018) from the JASON satellites, v1.1
history 2020-01-13 generated by X-TRACK v.1.03
source Jason-1 GDR-E, Jason-2 GDR-D, Jason-3 GDR-D, RADS 4.0, ALES
references http://www.esa-sealevel-cci.org/products
product_version 1-1
comment These data were produced at LEGOS as part of the ESA SL_CCI+ project.
project Sea Level Climate Change Initiative – European Space Agency
ecv SEALEVEL
processing_level L3
data_type SLA
abstract This dataset contains along-track sea level anomalies derived from satellite altimetry. Altimeter along-track sea level measurements from the Jason-1, Jason -2 and Jason-3 satellite missions have been processed to produce high resolution (20 Hz, corresponding to an along-track distance of ~300m) sea level anomalies, in order to provide long-term homogeneous sea level time series as close to the coast as possible in six different coastal regions (North-East Atlantic, Mediterranean Sea, Western Africa, North Indian Ocean, South-East Asia and Australia). These six time series cover the period from 15 January 2002 to 30 May 2018. The product benefits from the spatial resolution provided by high-rate data, the Adaptive Leading Edge Subwaveform Retracker (ALES) and the post-processing strategy of the along-track (X-TRACK) algorithm, both developed for the processing of coastal altimetry data, as well as the best possible set of geophysical corrections. The main objective of this product is to provide accurate altimeter Sea Level Anomalies (SLA) time series as close to the coast as possible in order to assess whether the coastal sea level trends experienced at the coast are similar to the observed sea level trends in the open ocean and to determine the causes of the potential discrepancies. The product has been developed within the sea level project of the extension phase of the European Space Agency (ESA) Climate Change Initiative (SL_cci+). During the project, the product will be extended in spatial coverage and with additional altimeter missions. This version of the dataset is v1.1. (DOI: 10.5270/esa-sl_cci-xtrack_ales_sla-200206_201805-v1.1-202005)
publication_date 2020-10-12T11:18:50
uuid 222cf11f49a94d2da8a6da239df2efc4
catalog_url https://catalogue.ceda.ac.uk/uuid/222cf11f49a94d2da8a6da239df2efc4
sensor_id multi-sensor
platform_id multi-platform
product_string N_INDIAN
cci_project SEALEVEL