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oceans

263 record(s)

 

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From 1 - 10 / 263

  • Physical, chemical and biological monitoring of water quality in estuaries within the Northland region for Northland Regional Council. Sampling sites are currently located in the Whangarei Harbour (WH), Bay of Islands (BOI) and Kaipara Harbour (KH), past data includes Hokianaga and Whangaroa Harours. Sampling frequency = 2monthly + 3 event driven sampling each year following heavy rainfall (WH, BOI), monthly (KH). Sampling began in 1986 (WH, BOI) and 2009 (KH) and is ongoing. Number of sites = 41 total currently. Since the start of the programme some sites have been dropped and some new sites have been added. Number of replicates = 1 per site. Measured variables = Water quality: salinity, DO%, DOmg/l, temp (YSI meter), Enterococci, faecal coliforms (Internal lab), TP, DRP, NNN, NH4, Turbidity (External lab), secchi, water depth (recorded in field). Sampling protocol & QA = Internal field monitoring manual and QA procedures. Water samples taken from top 0.5m of water column and sampling conducted at random tidal states, giving a more representative picture of water quality over time (WH, BIO) or high water (KH).

  • GeoTIFF of the mean summer sea surface temperature (SST) distribution within Tasman Bay-Golden Bay, based on remote-sensed data. NIWA maintains a retrieval system and a large archive for New Zealand satellite images, including for sea surface temperature.

  • GeoTIFF showing the interpolated scallop density distribution in Tasman Bay-Golden Bay. The analysis is based on survey data collected for the Challenger Scallop Enhancement Company between 1994 and 2012. Krigging was used to create this distribution surface using ARCMap 10.1. The underlying data are summarised in the metadata entry "Densities of scallops, dredge oysters, and bycatch in Golden Bay, Tasman Bay, and the Marlborough Sounds".

  • GeoTIFF showing salinity minima from winter cruises in 2001 and 2002. The distribution surface was generated from kriging interpolation (ArcMap ver 10.0, ESRI Inc. 1999-2010) based on data from 30 stations averaged over winter sampling cruises during 2001 and 2002. The winter minimum values ranged from 28.6 to 35.1 parts per thousand. Similar data were collected from summer cruises in 2001 and 2002.

  • Substrate type from DTIS video camera transects during OS 20/20 voyages TAN0705 (Chatham Rise) and TAN0707 (Challenger Plateau). DTIS is NIWA's Deep Towed Imaging System.

  • Shapefile representing the extent of the Separation Point Exclusion Zone Geographic Coordinate System: GCS_WGS_1984

  • Shapefile of the location of marine reserves in Tasman Bay. The two reserves shown here are: Tonga Island Marine Reserve established in 1993 and Horoirangi Marine Reserve created in 2005. Projected Coordinate System: NZGD_2000_New_Zealand_Transverse_Mercator Geographic Coordinate System: GCS_NZGD_2000

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    Time series of air quality measurements collected from permanent stations

  • Commercial trawl fishing data were provided by Ministry for Primary Industries to determine where fishing effort had taken place. Data were from Trawl Catch Effort Returns (TCER) and Trawl Catch Effort and Processing Returns (TCEPR) and included effort for flatfish, barracouta, snapper, red cod, and red gurnard. Data cover the time period 1 October 2008 to 16 November 2011. Where trawl data had only start tow positions (TCER data), trawl lines were generated on groomed data by plotting lines between consecutive trawl start positions, per vessel, per day (data excludes single trawls that fell on the same day). The Line Density Tool in ARCInfo vers. 10.0 was used to interpolate trawl tracklines giving each line a weight based on the estimated area towed. A geoTIFF shows the distribution of the density of trawl tracks.

  • GeoTIFF of the distribution of dominant sediment types within the Tasman Bay-Golden Bay. This represents a digitised version of the Tasman Sediments chart (Mitchell 1987). Sediment samples were collected during N.Z. Oceanographic Institute cruises during 1959–83 and Fisheries Research Division (MAF) surveys in 1982–84. Different grain size classes are identified and each class is separated into non-calcareous (<50% calcium carbonate) and calcareous (>50% calcium carbonate) groups. Spatial reference: GCS_WGS_1984