GLOBE STUDENT DATA FORMAT DESCRIPTIONS Note: All dates and times are in Greenwich Mean Time (GMT). Surface Water: Field 1 = SW Field 2 = GLOBE phase number (1 or 2) Field 3 = Site number Field 4 = Time the data was reported, YYYYMMDD where YYYY = Calendar year MM = Calendar month (starting with 1 = January) DD = Day of month (starting with 1) Field 5 = Time the data was sampled, YYYYMMDDHH where YYYY = Calendar year MM = Calendar month (starting with 1 = January) DD = Day of month (starting with 1) HH = Hour of day (00-23) Field 6 = Decimal year Field 7 = Measurement location latitude Field 8 = Measurement location longitude (+ = East, - = West) Field 9 = Measurement location elevation (meters above sea level) Field 10 = Water source state 0 - Unchecked 1 - Water Source frozen 2 - Water Source dried 3 - flooded 4 - unreachable Field 11 = Water Temperature (degrees celsius) Field 12 = Water pH: pH value Field 13 = Water pH: Measurement technique (coded value) 0 - Unchecked 1 - Paper 2 - pH Pen 3 - pH Meter Field 14 = Dissolved Oxygen: Distilled water (mg/L) Field 15 = Dissolved Oxygen: Concentration (mg/L) Field 16 = Alkalinity: Number of Drops Field 17 = Alkalinity: Range (coded value) 0 - Unchecked 1 - Low 2 - High Field 18 = Alkalinity: Concentration (mg/L as CaCO3) Field 19 = Electrical Conductivity (microSiemens) Field 20 = Salinity: Site Name Field 21 = Salinity: Site Latitude (degrees) Field 22 = Salinity: Site Longitude (degrees) Field 23 = Salinity: time of tide before measurement (HHMM) Field 24 = Salinity: type of tide before measurement (coded value) Field 25 = Salinity: time of tide after measurement (HHMM) Field 26 = Salinity: type of tide after measurement (coded value) Field 27 = Salinity: Hydrometer: temperature of water sample (degrees C) Field 28 = Salinity: Hydrometer: specific gravity Field 29 = Salinity: Hydrometer: salinity value (ppt) Field 30 = Salinity: Hydrometer: salinity average (ppt) Field 31 = Salinity: Titration: salinity value (ppt) Field 32 = Salinity: method (coded value) Field 33 = Nitrite + Nitrate (mg/L) Field 34 = Nitrite (mg/L) Field 35 = Transparency: Cloud cover (coded value) Field 36 = Transparency: Secchi disk distance to water surface (meters, sample 1) Field 37 = Transparency: Secchi disk distance to water surface (meters, sample 2) Field 38 = Transparency: Secchi disk distance to water surface (meters, sample 3) Field 39 = Transparency: Secchi disk Disappear depth (meters, sample 1) Field 40 = Transparency: Secchi disk Disappear depth (meters, sample 2) Field 41 = Transparency: Secchi disk Disappear depth (meters, sample 3) Field 42 = Transparency: Secchi disk Reappear depth (meters, sample 1) Field 43 = Transparency: Secchi disk Reappear depth (meters, sample 2) Field 44 = Transparency: Secchi disk Reappear depth (meters, sample 3) Field 45 = Transparency: Average Secchi disk depth ( meters) Field 46 = Transparency: turbidity tube depth (centimeters, sample 1) Field 47 = Transparency: turbidity tube depth (centimeters, sample 2) Field 48 = Transparency: turbidity tube depth (centimeters, sample 3) Field 49 = Transparency: Average turbidity tube depth (centimeters) Field 50 = Transparency: > tube depth flag (coded value, sample 1) Field 51 = Transparency: > tube depth flag (coded value, sample 2) Field 52 = Transparency: > tube depth flag (coded value, sample 3)