Falmouth Monthly Climate Reports

From: Subject: Falmouth Monthly Climate Reports Date: Mon, 3 May 2010 12:00:02 -0400 MIME-Version: 1.0 Content-Type: multipart/related; type="text/html"; boundary="----=_NextPart_000_0000_01CAEAB8.29AF0B20" X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5512 This is a multi-part message in MIME format. ------=_NextPart_000_0000_01CAEAB8.29AF0B20 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Content-Location: http://cis.whoi.edu/science/PO/climate/index.cfm Falmouth Monthly Climate Reports

Falmouth Monthly Climate=20 Reports

= | 2010=20 | 2009=20 | 2008=20 | 2007=20 | 2006=20 | 2005=20 | 2004=20 | 2003=20 | 2002=20 | 2001=20 | 2000=20 | 1999=20 | 1998=20 | 1997=20 | 1996=20 | 1995=20 | 1994=20 | 1993=20 |

Contact: Richard E. Payne, ext. = 2550

Definition of parameters on monthly climatological data=20 reports

Column Units Description

DAY Day of the month

DAYNO Year day number

SORADM watt-hours/m² Daily total of observed vertical solar energy = flux

SORADC watt-hours/m² Daily total of observed vertical solar energy flux = with no=20 atmosphere (calculated)

AT Dimensionless Atmospheric transmittance =3D = SORADM/SORADC

NOONALT Degrees Altitude of sun above horizon at solar = noon

TMAX Deg F Maximum air temperature during 24 hour = period

TMIN Deg F Minimum air temperature during 24 hour = period

DD65 Deg F Heating degree day total for house maintained at 70 = deg=20 F
DD65 =3D (TMAX + TMIN)/2 - 65

DD60 Deg F Heating degree day total for house maintained at 65 = deg=20 F
DD60 =3D (TMAX + TMIN)/2 - 60

PRECIP Inches Precipitation in 24 hour = period

Comments on measurements

Solar radiation = measurements are=20 made with an Eppley PSP pyranometer mounted on the roof of = the Clark=20 Building, Quissett Campus, Woods Hole Oceanographic = Institution. The=20 output signal of the sensor is sampled at 10 second = intervals and=20 averaged over an hour by a Campbell data logger. The hourly = totals=20 have been archived since 1991. Daily totals are computed = from the=20 hourly totals and have been archived since 1975.=20

TMAX, TMIN, and PRECIP are recorded by Falmouth Water = Department=20 employees at the town pumping station located on the shore = of Long=20 Pond, the town reservoir. Beacuse this is an inland site, = about 1.5=20 miles from the shore of Buzzards Bay, air temperatures may = differ=20 considerably from temperatures at shore sites. The = thermometers have=20 not been calibrated since they were purchased in 1960 and = their=20 absolute accuracy cannot be vouched for. TMAX and TMIN have = been=20 recorded since 1960, PRECIP since 1966. All data are = archived by=20 Dick Payne (Ext 2550).=20

Atmospheric Transmittance

Solar radiation received = at the=20 earth's surface can vary because of clouds, latitude, time = of year,=20 and time of day. If we consider only daily totals we = eliminate the=20 time of day. Because of the dependence on latitude and date, = daily=20 totals cannot be compared directly from one place and time = to=20 another but the dependence on latitude and date can be = compensated=20 for mathematically. Knowing a few astronomical parameters we = can=20 compute the amount of solar radiation which would fall on = the=20 earth's surface at a given location and date. If we compute = it for=20 Woods Hole and divide our measured daily totals by these = computed=20 daily totals, we get an index for each day which has a value = between=20 0 and about 0.75. This index is called the atmospheric = transmittance=20 (AT). A clear day yields an index of about 0.75; a very = cloudy day=20 might have an index of 0.1. This index changes primarily = with the=20 effects of the atmosphere (clouds, water vapor) but has the = effects=20 of latitude and date removed. This index can then be used to = compare=20 atmospheric effects at one location with those at another = and one=20 time of year with another.

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