Acceptance and utilization of LTER data requires that:
(1) The Principal Investigator be sent a notice stating reasons for acquiring any data and a description of the publication intentions.
(2) The Principal Investigator of the data set be sent a copy of the report or manuscript prior to submission and be adequately cited in any resultant publications.
(3) A copy of any resultant publications should be sent to:
Principal Investigator
Ecosystems Center
Marine Biological Laboratory
7 MBL St.
Woods Hole, MA 02543
| Dataset URLs: | METADATA: HTML, Rich Text, XML(EML compliant) DATA: Comma Delimited, Excel file with Metadata and data |
| Dataset ID: | WAT-YSI-SIGMA-timeseries.01 |
| Dataset Title: | Time series of nutrient grab samples from catchments with frequency ranging from weekly to monthly between 2001 and 2006. |
| Investigator 1: | |
| First Name: | Charles |
| Last Name: | Vorosmarty |
| Address line 1: | Morse Hall |
| Address line 2: | UNH |
| Address line 3: | |
| City: | Durham |
| State: | NH |
| Zip Code: | 03824 |
| Country: | USA |
| Investigator 2: | |
| First Name: | Wilfred |
| Last Name: | Wollheim |
| Address line 1: | Morse Hall |
| Address line 2: | UNH |
| City: | Durham |
| State: | NH |
| Zip Code: | 03824 |
| Country: | USA |
| Associate Investigators: | Brian Pellerin, Joe Thouin |
| Keywords: | PIE LTER, catchments, Plum Island, Massachusetts, ammonium, dissolved, nitrate, nitrogen, nutrient, phosphate, phosphorus, silicate, organic, carbon |
| Abstract: | Time series of nutrient grab samples collected by hand (i.e. not with the Sigma autosampler) with frequency ranging from weekly to monthly between 2001 and 2006. Sites include three headwaters catchments of contrasting land use (forest, urban, wetland), the mouth of the two main watersheds draining to the Plum Island Estuary (Ipswich and Parker R.). An additional time series was collected for a site in the Upper Ipswich at North Reading and at Fish Br. in Boxford – this sampling was ended in 2002. Samples were analysed for NO3, NO2, NH4, PO4, Si, TDN and DOC. |
| Contact: | Plum Island Ecosystems LTER Information Manager The Ecosystems Center Marine Biological Lab 7 MBL St Woods Hole, MA 02543 Phone (508) 289 7485 Email: pie_im@mbl.edu Online URL: http://ecosystems.mbl.edu/PIE/ |
| DATA FILE INFORMATION: | |
| Data File URL | http://ecosystems.mbl.edu/PIE/data/WAT/data/WAT-YSI-SIGMA-timeseries.dat |
| Data File Name | WAT-YSI-SIGMA-timeseries |
| Beginning Date | 6/12/2001 |
| End Date | 7/6/2006 |
| Number of Data Records | 419 |
| Other Files to Reference | All files with YSI, and nutrient data |
| Availability Status | Type 1 |
| Quality Control Information | |
| Maintenance Description | Updated periodically |
| Log of Changes: | 01) 4Oct2007, EML 4-5 level, |
| RESEARCH LOCATION: | Site 1 |
| Geographic Description | Watershed, YSI-CC (forest) |
| Location Bounding Box | |
| West Bounding Coordinate | |
| East Bounding Coordinate | |
| North Bounding Coordinate | |
| South Bounding Coordinate | |
| OR if single point location | |
| Latitude | 42.7692 |
| Longitude | -70.9165 |
| Methods: | Samples were either kept cold until filtered within several days of collection, or filtered immediated in the field. Filtered samples frozen until analysis. Analysis was conducted at UNH either by the lab of Ted Loder (samples with grid-code = UNH_Grab) at MBL (grid-code = Sigma Grab and Lab_ID = NA) or at UNH by the lab of Bill McDowell (grid-code = Sigma Grab and Lab_ID = McDowell Lab) Samples were analysed using Lachat methods. RESEARCH LOCATION: x and y coordinates given below are in MA State Plane NAD83 (meters). Sites were georeferenced to a gridded river network with 120m grid sizes. X and Y coordinates reflect slight shifts to ensure proper placement on the digital river network. Contributing area is listed in km2 Permanent_ID Site X Site Y Description YSI-SB 225840 919310 Suburban Headwater Stream YSI-CC 247680 946790 Forested Headwater Stream YSI-CS Wetland Headwater Stream YSI-IR 232080 923630 Upper Ipswich R. YSI-FB 240600 934310 Fish Br. IP24 254280 936350 Mouth of the Ipswich (Sylvania Dam) 10 246600 944510 Mouth of the Parker (Central St.) |
| Variable Name | Variable Description | Units | Measurement Scale | Code Infomation | Number Type | DateTime Format | Missing Value Code | Missing Value Code Explanation |
| Permanent_ID | station ID | nominal | YSI-CC = Cart Creek (forest) | YS-CS = Cedar Swamp (wetland) | YSI-SB = Saw Mill Br (urban) | IP24 = Ipswich R. Dam Ipswich | 10 = Parker R. Dam Byfield | YSI-IR = upper Ipswich R. in N. Reading | YSI-FB = Fish Br. In Boxford | blank cell | ||||
| SampleType | Identifies the type of sample collected | nominal | UNH-GRAB = Grab sample collected by UNH prior to 2003 | Sigma-GRAB = Grab sample collected by either MBL (prior to 2004) or UNH (after 2004) | blank cell | ||||
| Lab_ID | ID used to track sample through lab | nominal | PK* = unique sample identifier for samples analysed in the Loder Lab at UNH | McDowellLab_YYYY = analysis at the McDowell Lab in year YYYY | NA = sample analysed at MBL prior to 2003 | blank cell | ||||
| DATE | date (yyyy-mm-dd) | datetime | yyyy-mm-dd | blank cell | ||||
| NO3 | nitrate + nitrite-N (µM-N) | microMolesPerLiter | ratio | real | blank cell | |||
| NH4 | ammonium-N (µM-N) | microMolesPerLiter | ratio | real | blank cell | |||
| PO4 | soluble reactive phosphorus (µM-P) | microMolesPerLiter | ratio | real | blank cell | |||
| NO2 | nitrite-N (µM-N) | microMolesPerLiter | ratio | real | blank cell | |||
| Si | dissolved silica (µM-S) | microMolesPerLiter | ratio | real | blank cell | |||
| TDN | total dissolved nitrogen (µM-N) | microMolesPerLiter | ratio | real | blank cell | |||
| DOC | dissolved organic carbon (µM-C) | microMolesPerLiter | ratio | real | blank cell | |||
| PON | particulate organic nitrogen (µM-N) | microMolesPerLiter | ratio | real | blank cell | |||
| POC | particulate organic carbon (µM-C) | microMolesPerLiter | ratio | real | blank cell |