MODIS Outline at NASA HQ Survey August 23, 2005 of EOS Water INSTRUMENT Inconsistencies Vincent V. Salomonson MODIS Scie

Presentation Transcript

MODIS OVERVIEW at NASA HQ REVIEW August 23, 2005 of EOS AQUA INSTRUMENT ANOMALIES Vincent V. Salomonson MODIS Science Team Leader X. (Jack) Xiong MODIS Characterization Support Team (MCST) Leader And MODIS Project Scientist

MODIS Key Specifications

Instrument Overview MODIS RSB Key Specifications

Instrument Overview MODIS TEB Key Specifications

Ocean Chlorophyll (top) and ocean surface temperature (SST) watched through the Aqua MODIS instrument .

MODIS/Aqua & SeaWiFS Global Mean Chlorophyll Time Series: Consistency Clear-water: chl-a < 0.15 mg/m 3 Deep-water: profundity > 1000 m Coastal: profundity < 1000 m Offset because of chlorophyll-a calculation distinction at high focuses Dashed line: MODIS Solid line: SeaWiFS

Frequency of clear sky conditions (cloud portion under 20% in 1° network box) over land (King, Platnick, et al. NASA/GSFC

2-D likelihood thickness capacity of cloud noticeable optical thickness and successful sweep for marine limit layer mists off the bank of California. (Lord/Platnick, et al., NASA/GSFC

MODIS/Terra+Aqua Albedo 16-Day L3 Global 0.05Deg CMG for July 2002 (C. Schaaf, A Strahler - Boston College

Fires proceeded in focal Alaska, as found in this MODIS Aqua picture . As indicated by the Fairbanks North Star Borough , air quality conditions are dangerous (Code Maroon, more than 300 ug/m3). Hourly fixations prior in the week spiked more than 1000 ug/m3. As per AIRNow, dangerous conditions are relied upon to proceed.

Global emissivity of land surfaces from MODIS (Zhengming Wan- - UCSB The 5km MODIS LST item recovered by the day/night LST calculation from MODIS information gives new learning of emissivities at 3.75µm, 3.96µm, 4.05µm, 8.75µm, 11µm and 12µm (MODIS groups 20, 22, 23, 29, and 31-32) at the worldwide scale

EOS Direct Readout Sites ~100 Ingest locales around the globe for Terra/Aqua DB downlink Over 800 Users of information reaching out from 82 ingest destinations List is situated on the Direct Readout Portal

MODIS On-circle Calibration and Characterization MODIS On-board Calibrators (OBCs) Page 13

Schematic of MODIS On-circle Calibration SDSM Solar Diffuser SRCA SDSM Blackbody SD/SDSM (week by week first year to bi-week after week) SRCA (month to month radiometric, bi-month to month spatial, quarterly unearthly) BB (quarterly warm-up) Maneuvers (move: month to month Moon ; yaw: 2 for Terra and 1 for Aqua; pitch: 2 for Terra) Scan Mirror Space View Moon Starting from July 2, 2003, Terra MODIS SD entryway altered at open with SD screen down; more endeavors for SD adjustment information investigation Page 14

Aqua Spatial Characterization (along-track) Days are numbered from 2002

Aqua Spatial Characterization (along-sweep) Days are checked from 2002

Aqua MODIS Spectral - l C Shift

BACKUP SLIDES

Spatial and Spectral Characterization Using SRCA Spatial Frame - > x Spectral Grating stride - > q Page 20

SRCA Functions In the ghostly alignment mode , a light source from the coordinating circle (SIS) gives enlightenment to the noticeable (VIS), close infrared (NIR), and short wave infrared (SWIR) groups. The light originating from the coordinating circle is bobbed off of a toroidal (3-D donut shape) hand-off reflect into the passage of an adjusted Czerny-Turner monochromator (an instrument that gets the light of one wavelength or exceptionally limit band of the light range). The monochromator contains an engine driven grinding/reflect get together, which is utilized as a part of conjunction with a channel wheel (to shut out-of-band vitality) to diffract the light into one of the VIS, NIR, or SWIR groups. The diffracted light leaving the monochromator is then sent into a Cassegrain telescope that moves the light to the right rise and edge (called collimating) and after that skips it off of an altered overlay reflect onto the Scan Mirror. The light starting here travels through MODIS' principle optical framework and onto the identifiers where the resultant adjustment information is incorporated into the general sweep information. At least, one SRCA ghostly wavelength estimation is taken per insurgency of the Scan Mirror. PC demonstrating has demonstrated that the precision of this adjustment strategy is inside 1 nanometer . The SRCA framework is likewise ready to perform self-alignment by embeddings didymium glass close to the light source and detecting the SRCA's reaction profile utilizing a photodiode at the exit of the monochromator. In the radiometric adjustment mode , the passageway and leave openings to the SRCA are open and a silvered reflect replaces the grinding. This distinction makes the monochromator into a transfer, where light from the incorporating circle is sent to the passageway gap for the alignment of MODIS' intelligent groups. In this mode, the SRCA is intended to give six brilliance levels that are steady to inside one percent over an orbital time of 100 minutes. This solidness is accomplished by a brilliance criticism circle that depends on contribution from a temperature-controlled photodiode.

SRCA Functions (proceeded) In the spatial enrollment mode , the passage to the monochromator is open, and a reticle example (a matrix or example that sets up scale or position) is put at the exit of the monochromator. Notwithstanding the VIS-NIR-SWIR enlightenment, the radiation from a resistive warmer is coupled into the framework by means of an ITO dichroic beamsplitter (parts the light into two hues), which gives vitality to bolster the spatial enrollment for the warm groups. The uncommonly planned reticle designs at the leave opening of the monochromator are then anticipated into the MODIS optical framework, which are then re-imaged and filtered by the different FPAs to produce the information for the spatial enlistment calculation. The outcome is a record of the FPA spatial enlistment over the life of the instrument, which is vital to exhibiting MODIS' dependability.

Terra Spatial Characterization (along-sweep) SD entryway open effect.

Terra Spatial Characterization (along-track)

Terra MODIS Spectral - l C Shift