TemperateReefBase Geonetwork Catalogue
Investigating the relation between aerosol optical depth, dimethylsulphide production and phytoplankton dynamics in the Antarctic Southern Ocean
---- Public Summary from Project ----
Understanding the strength of possible biological feedbacks is crucial to the science of climate change. This project aims to improve our understanding of one such feedback, the biogenic production of dimethylsulphide (DMS) and its impact on atmospheric aerosols. The Antarctic ocean is potentially a major source of DMS-derived aerosols. The project will investigate the coupling between satellite-derived aerosol optical depth, phytoplankton biomass and DMS production in the Antarctic Southern Ocean.
From the abstract of the attached paper:
We analysed the correlation between zonal mean satellite data on surface chlorophyll (CHL) and aerosol optical depth (AOD), in the Southern Ocean (in 5-degree bands between 50-70 degrees south) for the period 1997-2004), and in sectors of the Eastern Antarctic, Ross and Weddell Seas. Seasonality is moderate to strong in both CHL and AOD signatures throughout the study region. Coherence in the CHL and AOD time series is strong between 50-60 degrees south, however this synchrony is absent south of 60 degrees south. Marked interannual variability in CHL occurs south of 60 degrees south. We find a clear latitudinal difference in the cross-correlation between CHL and AOD, with the AOD peak preceding the CHL bloom by up to six weeks in the sea ice zone (SIZ). This is consistent with the ventilation of dimethysulphide (DMS) from sea-ice during melting, and supports field data that records high levels of sulfur species in sea-ice and surface seawater during ice-melt.
The fields in this dataset are:
Timeseries Worksheet:
Date
Mean Chlorophyll (mg CHL/cubic metre)
Mean Aerosol Optical Depth (no units)
5 Day mean chlorophyll averages
5 day mean aerosol optical depth averages
Correlation Worksheet:
n - number
lag
r - correlation coefficient
t - student t statistic
Global Worksheet
Column A = SeaWiFS filename
Counter+1 is a counter to indicate the image number in series
Date
Mean Chlorophyll (mg CHL/cubic metre)
Mean Aerosol Optical Depth (no units)
Chlorophyll Standard Deviation
Mean Aerosol Optical Depth Standard Deviation
Chlorophyll Standard Error
Mean Aerosol Optical Depth Standard Error
Chlorophyll Count (the number of data 'pixels' in the image - the basic pixel size is 9x9km2)
Mean Aerosol Optical Depth (the number of data 'pixels' in the image - the basic pixel size is 9x9km2)
Simple
Identification info
- Alternate title
- Investigating the relation between aerosol optical depth, dimethylsulphide production and phytoplankton dynamics in the Antarctic Southern Ocean
- Date (Publication)
- 2016-04-30
- Edition
- 1
- Citation identifier
-
Dataset DOI
- Title
- Information and documentation - Digital object identifier system
- Date (Publication)
- 2012-04-23
- Citation identifier
- ISO 26324:2012
- Citation identifier
- doi:10.4225/15/574BBA6E621F5
Originator
Publisher
Principal investigator
Collaborator
- Name
- CAASM Metadata
- Status
- Completed
Custodian
- Topic category
-
- Biota
- Oceans
Extent
))
Extent
- Description
- Temporal Coverage
Temporal extent
- TimePeriod
- 1997-09-01 2004-02-29
- NASA/GCMD Earth Science Keywords
-
- EARTH SCIENCE > CRYOSPHERE > SEA ICE > ICE GROWTH/MELT
- EARTH SCIENCE > CRYOSPHERE > SEA ICE
- EARTH SCIENCE > OCEANS > MARINE ENVIRONMENT MONITORING
- EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > TRACE ELEMENTS
- EARTH SCIENCE > OCEANS > OCEAN OPTICS > OPTICAL DEPTH
- EARTH SCIENCE > OCEANS > SEA ICE > ICE GROWTH/MELT
- EARTH SCIENCE > OCEANS > SEA ICE
- EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PLANTS > MICROALGAE
- EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > AQUATIC ECOSYSTEMS > PLANKTON > PHYTOPLANKTON
- EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PIGMENTS > CHLOROPHYLL
- EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > SPECIES/POPULATION INTERACTIONS > SPECIES LIFE HISTORY
- EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > BIOMASS DYNAMICS
- Keywords
-
- AEROSOL OPTICAL DEPTH
- ALGAE
- ANTARCTICA
- AOD
- BLOOM
- CHL
- CHLOROPHYLL
- DATE
- DIMETHYLSULPHIDE
- DMS
- EASTERN ANTARCTICA
- PHYTOPLANKTON
- ROSS SEA
- SATELLITE
- SEA ICE
- SEAWIFS
- SOUTHERN OCEAN
- SULFUR
- WEDDELL SEA
- NASA/GCMD Earth Science Keywords
-
- AMD/AU
- CEOS
- AMD
- NASA/GCMD Earth Science Keywords
-
- OCEAN > SOUTHERN OCEAN
- OCEAN > SOUTHERN OCEAN > Ross Sea
- OCEAN > SOUTHERN OCEAN > Weddell Sea
- GEOGRAPHIC REGION > POLAR
Resource constraints
- Use limitation
- This metadata record is publicly available.
Resource constraints
- Access constraints
- licence
- Other constraints
- The data from this project are publicly available for download from the provided URL.
Resource constraints
- File type
- Portable Network Graphic
- Title
- Attribution 4.0 International (CC BY 4.0)
- Website
-
https://creativecommons.org/licenses/by/4.0/legalcode
Legal code for Creative Commons by Attribution 4.0 International license
- Use constraints
- licence
- Other constraints
- This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_2319 when using these data.
- Language
- English
- Character encoding
- UTF8
Distribution Information
Distributor
Distributor
Distributor
- Fees
- free
- Planned available datetime
- 2016-04-30T00:00:00
- Units of distribution
- kb
- Transfer size
- 560
- Distribution format
-
- Excel, PDF
- OnLine resource
-
GET DATA
Download point for the data - paper and excel spreadsheets
- OnLine resource
-
PROJECT HOME PAGE
SeaWiFS home page
- OnLine resource
-
PROJECT HOME PAGE
Public information for ASAC project 2319
- OnLine resource
-
VIEW RELATED INFORMATION
NSIDC - National Snow and Ice Data Centre
- OnLine resource
-
VIEW RELATED INFORMATION
Citation reference for this metadata record and dataset
Resource lineage
- Statement
- CHL (mg per cubic metre) and AOD were obtained from the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) archive for the period Sept 1997 - Feb 2004. Level 3 (9x9 square kilometre) 8-day binned data representing 46 products per year were processed into standard mapped image (SMI) format. The AOD is proportional to aerosol particle concentration from the ocean surface to the top of the atmosphere and can be retrieved with an accuracy of 10%. This resulted in 323 images layered into composite files for each of CHL and AOD. Sea ice data were obtained from the 'Nimbus-7 SMMR, DMSP SSM/I Passive Microwave Data, Daily and Monthly Polar Gridded Sea Ice Concentration' data administered by the National Snow and Ice Data Centre (NSIDC). The wind speed climatology was obtained from the NCAR data repository (Scientific Computing Division Data Support Section, Boulder, CO). The time series were analysed in four global latitude bands: 50-55 S, 55-60 S, 60-65 S and 65-70 S. Five-period moving averages were used to analyse temporal trends between mean CHL and AOD using data from each octad. Cross-correlation was then used to determine the relationship between parameters within each global band with a plus or minus 7 period lag. A lag of L periods referred to the correlation of CHL(t) with AOD(t=t+L). In the (60-70 S) band, data were only available from Sept-April due to the Antarctic winter. To retain valid sample sizes, bi-yearly data-sets were lagged and then appended to create a single multi-year data set (1997-2004) within each latitude band. The relationship between CHL and AOD was also explored in the longitudinal sectors: a) the Eastern Antarctic (110-140 E, 60-70 S), b) the Ross Sea (160-135 W, 60-80 S) and c) the Weddell Sea (65-0 W, 55-80 S). To explore the contribution of the SIZ to algal productivity and aerosol loads we compared the temporal cycles in CHL, AOD and sea ice cover. Mean monthly ice cover was calculated for the period Jan 1997 - Dec 2003 for 2 degree global latitude bands between 60-71 S. Effectively, this provided data up to the eastern Antarctic coastline. To ensure valid data for regions above 70 S, the analysis was repeated to cover the Ross and Weddell Sea sectors that extend further south.
- Hierarchy level
- Dataset
- Maintenance and update frequency
- As needed
- Maintenance note
- 2016-04-13 - record updated by Dave Connell - basic updates.
Metadata
- Metadata identifier
- string/ASAC_2319
- Language
- English
- Character encoding
- UTF8
Author
Sponsor
Owner
Type of resource
- Resource scope
- Dataset
Alternative metadata reference
- Title
- gov.nasa.gsfc.gcmd
- Citation identifier
- a708229a-1ade-4c8a-96c3-b6bfdd294624
Alternative metadata reference
- Title
- gov.nasa.gsfc.gcmd
- Date (Last Revision)
- 2015-11-29T18:25:08
Identifier
- Description
- metadata.extraction_date
Alternative metadata reference
- Title
- gov.nasa.gsfc.gcmd
- Citation identifier
- 8.6
- Metadata linkage
-
http://data.aad.gov.au/metadata/records/ASAC_2319
Point of truth for the metadata record
- Date info (Creation)
- 2002-07-02T00:00:00
- Date info (Last Update)
- 2017-04-26
Metadata standard
- Title
- ISO 19115-3
- Edition
- 2014
- Other citation details
- Version 1
- Title
- DIF to ISO 19115-1 Profile
Overviews
Spatial extent
Provided by
