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thanks for that link logicman.. prompted me to delve a bit further into the background on these cam... i believe the 'heaters and blowers' are to keep the solar panels clear, as for the Cam "NOAA is keeping the device turned off except for just ten minutes every six hours, in order to conserve its solar-charged battery power". Also, If you look at the CAM specs, there is no need for a heater for it to function well. # Operating temperature: -40 to +48 deg. C # Power requirements: 7.2VDC-10VDC, 1A, 9VDC power supply included # fully isolated relay or photo flash trigger, rated at 28VDC 2A or 125VDC 0.5A # 5VDC 50mA regulated power supply http://thing1.linuxdevices.com/articles/AT4739871225.html http://www.noaanews.noaa.gov/stories/s898.htm The images will track the North Pole snow cover, weather conditions, and the status of NOAA's Pacific Marine Environmental Laboratory's North Pole instrumentation, according to James Overland, head of NOAA's North Pole Project. Although the webcam is capable of transmitting camera video at the rate of an image per second, NOAA is keeping the device turned off except for just ten minutes every six hours, in order to conserve its solar-charged battery power. Four times a day, the webcam wakes itself up and places a phone call to NOAA so that its data can be collected (the data is transferred by 2400 baud modem, through the Iridium low earth orbit satellite system, using PPP). The webcam contains a temperature sensor, allowing the temperature of its local environment to be monitored -- note the temperature reading in the lower left-hand corner of the above photo (Click here for an enlarged photo). Various configuration parameters -- including zoom, frequency of photos, and other camera settings -- can be remotely configured via web access.
Peter, I did consider a heater, but things start getting complicated, eg a far bit of additional power needed, larger enclosure enclosure, deviating from the KISS model - lots more things that could go wrong. But in a sealed, insulated container (think deep space probe), a cam flash would give off additional heat. checking NOAAA site again and "The instruments typically continue to transmit data for months after the solar-powered web cams stop".. solar power heater in frigate NP, its improbably but not impossible.
The mysterious NOAA Cam 2 temperature variation solved.. As this got myself and couple others curiosity going a couple of days back, so i thought i'd revisit it as my speculative 'its the ice melting off the enclosure' didn't seem right. So i did a little delving and this is what I've discovered.. - Every 6 hours, Cam_2 takes a set of up to 6 images. (speculate that some images drop via comm. loss) - a 2 to 3 minute separation between each image capture in the set. - Internal Temp start at ~4.5C and typically ends the last shot at ~12c The reason for the ~8c temp variation is very likely due to the camera flash, causing an increase of about 2c per shot. The additional heat is then lost within 6 hours, and starts the next cycle again at 4.5c internal temp. Shot Cycles taken at (+/- 10 minutes) 01:0X 07:0X 13:0X 19:0X Why is this of interest? resolve confusion on interpreting internal cam temperature. The temperature variation may affect the image quality or colour (can anyone confirm this?) http://www.arctic.noaa.gov/npole/index.php http://www.arctic.noaa.gov/npole/2010/images/noaa2-2010-0719-070708.jpg http://www.arctic.noaa.gov/npole/2010/images/noaa2-2010-0719-071708.jpg
Andrew, i reckon that temp change was caused by the snow melting off the cam enclosure, slightly above freezing water(just melted) V's snow insulation (11.5c). Water being a better conductor of heat then snow or ice. if the cam2 time is reporting correctly, then in the space of 8 minutes, a 7.5 temp increase occurred. http://www.arctic.noaa.gov/npole/2010/images/noaa2-2010-0719-011736.jpg - 11.5c http://www.arctic.noaa.gov/npole/2010/images/noaa2-2010-0719-070708.jpg - 3.5c http://www.arctic.noaa.gov/npole/2010/images/noaa2-2010-0719-070908.jpg - 6.5c http://www.arctic.noaa.gov/npole/2010/images/noaa2-2010-0719-071108.jpg - 8c http://www.arctic.noaa.gov/npole/2010/images/noaa2-2010-0719-071308.jpg - 9.5c http://www.arctic.noaa.gov/npole/2010/images/noaa2-2010-0719-071508.jpg - 11c
Cam2 is clear of snow, background buoy is still on the prowl, at this pace it will be out of view within 36 hours. http://www.arctic.noaa.gov/latest/noaa2.jpg
thanks for the compliment Neven, as a kid my mates wanted to be football players whereas i wanted to be a scientist like Carl Sagan (fortunate enough to have parents that insisted i watch cosmos series as a kid). then discovered in my teens that its a difficult(getting grants) low paying career, so went into software development field instead.
silly me, NOAA provide an archive of all archive Cam pictures gathered and search tools here.. http://www.arctic.noaa.gov/npole/index.php
PereE, when the wind direction changes, a 10c drop in temp can occur in a the space of an hour or less. You can see frequent example this from the Alert airport station. http://text.weatheroffice.gc.ca/forecast/24_hour_conditions_e.html?ylt&unit=m if you map those coordinates into bing maps, if POPS-13 plot changes direction between 2 and 3am on the 15th, then the drop is very likely due to wind direction change.
PeterE, unfortunately my attention wasn't on Cam1 on the 7th, if someone has the hourly images on the 7th upto the last transmission, then one might be able to identify if cam1 moved or collapsed due to a melt pool forming at its base. I only discovered the hourly images on the 12th. In future, with more eyes on these cam images we should be able to deduce why certain events occur.
Neven - always a pleasure to share. Quote from Carl Sagan seems fitting, When you make the finding yourself - even if you're the last person on Earth to see the light - you'll never forget it.
Kevin, a low pressure entered the NOAA cam2 Arctic basin region, causing a)drop in temperature b)change in wind direction c)snow/rain mixed showers - all identified within the captured picture information. internal cam2 temperature dropped to 12c on the 18 before snow began. As wind picked up and changed direction, the background marker and its surrounding ice chunk moved in the direction of the wind, relative to the camera2 position. 've been capturing 3 or 4 cam2 images a day and comparing for the past week, pool expansion and surface melt is visible within the day to day compared images. sat and sun images show snow falling and partially obscuring the cam short which then covered the cam as of yesterday evening. I reckon the cam will clear again and snow melted away within a day or two. Whats fascinating with these camera shots is to observe the difference in surface melt rate on sunny v's overcast days via observation of melt pool growth, internal cam temp readings. how the surface fractures and breaks, how new snow can temporarily cover these fractures/pools hiding the pack disintegration. how melt pools fill, empty, interact with other pools, how change in wind direction affect the surface melt, etc. etc lots of information to extract from these hourly cameras shots
spotted something interesting on the NOAA NP live cam 2 over the last couple of days. http://www.tadpolesoftware.com/ice/noaa2_Jul_17_to_18.gif Its a great snap of pack breaking up within the mid Arctic basin during a 24 hours period. A large continuous crack/ appears and background instrument marker moves dramatically, first time i've seen this type of activity - up close evidence of the dramatic breakup of this so called 'impenetrable ice'. The breakup seemed to be caused by a change in wind direction bringing light snow showers which are currently coving the camera at this time. the NOAA site link updates ever hour http://www.arctic.noaa.gov/latest/noaa2.jpg whereas the http://psc.apl.washington.edu/northpole/webphotos/noaa2.jpg only gets updated every day (Neven using the daily one on his graph page). nice online tool for gif animations - http://www.image-tools.com/Animated-GIF-Generator-Tool.php
correction, its only the uni Bremen maps back up so far, got carried away in my excitement seeing virgin map data.
and from CT maps it looks like Neven will be releasing a Northwest passage is now Open for business article over the next 3 to 5 days.
NewFlash - the map drought has just ended.. happy to report that CT maps are now back on-line! http://www.iup.uni-bremen.de:8084/amsr/arctic_AMSRE_nic.png
I'm curious, that 11k chunk off E. Greenland, when she breaks up how will that affect the 200k ice area reported on http://arctic.atmos.uiuc.edu/cryosphere/IMAGES/recent365.anom.region.5.html.. If these are 25km - 15% concentration maps reading, then that 11k ice area could turns into 30k+ for a couple of weeks. I checked against 2009 and its all new ice cover (eg area was cleared), little multi year drifted in there when the ice reformed (http://rapidfire.sci.gsfc.nasa.gov/subsets/?subset=Arctic_r02c03.2009275.aqua.500m.jpg), got very cloudy so hard to tell if any multi-year pushed in there after day275. So 2 shillings on Greenland East ice area staying at ~200k +/-15k until Aug 1st.
There's another plausible reason that all the maps are off-line at present. a large M type solar flare has been active over the prior week, a good reference for space weather is http://spaceweather.com/archive.php?view=1&day=13&month=07&year=2010 . I'm not too familiar with sunspots and flares,but the M class can cause substantial radio interference and effects polar regions most. If this is the case, then maps may be off line for another while yet, Sunspot 1087 is becoming more active. maybe UV maps effected more then normal maps(Modis). Anyone familiar with the tech site of these polar satellites.. Have they been shut down into 'safe mode' to protect instruments? Alternatively maybe Goddard is right and its a vast conspiracy to hide the mid summer increase in ice volume :D
Newsflash - Web cam 2 reporting 19.5c temp inside its box, prior high was 13.5c - ave 11.5c. bright sun and seems like ice fog or steam on the camera.. http://psc.apl.washington.edu/northpole/webphotos/noaa2.jpg
Toggle Commented Jul 12, 2010 on Animation 7: Jakobshavn Isbræ at Arctic Sea Ice
The Nares Strait flow reversal continued at increased speed yesterday(11/7 flow +50% compared to 10/7) With 21.7km reversal flow speed recorded by Boey 7440 yesterday. (fastest daily flow recorded by Boey 7440) Thats a total 35km in 2 days, or in water volume terms Area of water : 1,330 km(squared) volume of water : 38km(width) X35km(length) x.4km(dept) = 532km(cubed) I like the analogy of plunger on a sink hole, I'm still trying to get a basic understanding of the strait hydro dynamics, lots of facters involved such as salinity, currents, tides, winds etc. One draft paper called 'Nares Strait Hydrography and Salinity Field From a Three-Year Moored Array' yet to be approved for publication in journal of geophysical research, is illuminating regarding the complex interaction of fresh water coming out of the basin and more saline deep water going in. http://www.earth.ox.ac.uk/~helenj/work/publications/Berit1.pdf I like the sink plunger analogy to describe the effect of the this flow reversal, causing increased turbulence in the Roberson channel, and the straits entrance, shifting and breaking up of multi-year land-fast ice and shelves. Sunday reverse flow - pin 17 to pin 18 http://www.bing.com/maps/#JnE9LjgyJTQwMjIwNSsrKystNjAlNDAyNzgzJTdlc3N0LjAlN2VwZy4xJmJiPTgyLjQ4NTkwNzgyMDgxMTQlN2UtNTUuMDk0OTA1NTE3NTc4MSU3ZTgxLjM5MjIzOTkwMTglN2UtNjcuNzczMTI4MTczODI4MQ==
Toggle Commented Jul 12, 2010 on What's happening here? at Arctic Sea Ice
i used html bold tags, but the closing tag was missing a backslash, resulting in two open bold tags.. this second close tag should sort it out. thanks for reposting on the relevant new blog entry. Bouy 7440 data for today should be out in 2 or 3 hours time - should be interesting to see if it exceeds the 14km reverse speed from yesterday.
nice anim as usual Neven, and curious timing. the ol saying springs to mind, great minds think alike. its looks like another 3 days of reverse flow if the Russians have it right http://www.aari.nw.ru/clgmi/forecast/show_drift.asp?fign=0&lang=0 indicates stronger reverse flow for today and tomorrow (10th,11th,12th), compared to yesterday reverse flow start. should be interesting to see its affect on the region.
Toggle Commented Jul 11, 2010 on What's happening here? at Arctic Sea Ice
blog comments are stuck on bold tag.. this should clear it
correction on 2010 Nares Strait predictions (old estimates).. > normal flow out : 480km2/day > estimate on amount of Out Flow - 190 days > total ice outflow over 2010 period - 91,200 now deduct any reverse flow days. note - reverse flow has a bigger impact on ice extent in Arctic basin then normal out flow at this time of year due to the pumping of 500km2 of warm water back into the basin region. how to quantify 'bigger impact' will be seen over coming days.
Andrew, I believe that large chuck off Alert is due to the flow reversal in the Nares Straits that started yesterday. http://www.bing.com/maps/?v=2&cp=82.042~-61.548&lvl=9&cid=4AF6474AAB468769!116&eo=0 The speed of reverse flow of much warmer water from the Straits back into the Arctic basin is 14km a day (point 16 to point 17). Each day this continues, I would expect significant melting within 30km radius from the mouth of the Straits, growing each day as roughly 500km2 area of water is pushed back into the Arctic. Alert is within 20km of the Straits entrance. and this is first time I've see a reverse flow this year(it may have occurred I just haven't spotted it, no buoy data to verify it) Nevan, over prior days, i've been pondering your prior query regarding historical flow, regarding historical flow, sorry about the delay I'm somewhat cautious on estimates of this nature, these figures are preliminary and based on my own basic knowledge and review of the data, so please don't use this as definitive data in any way. with that disclaimer.. ============= 2009 ============= – had 61 days (of ice flow) = 30k (km2) total flow though the straits (using linear daily flow rate of 480km2). Note: 2009 was somewhat unusual, the Straits were clear for a couple months before the ice started to flow, indicating that a lot ticker multi-year ice at the entrance didn't break and start to flow up until day 194. Compare that with 2010 ice flow started on day 100, 94 days earlier then last year. Ice Flow Start – day194 http://rapidfire.sci.gsfc.nasa.gov/subsets/?subset=Arctic_r03c03.2009194.terra.500m.jpg Ice Flow End – day255 http://rapidfire.sci.gsfc.nasa.gov/subsets/?subset=Arctic_r03c03.2009255.terra.500m.jpg ============= 2010 ============= Estimate of ice flow - 155 days = 99k (km2) Current Julian day: 190 - Est. 58k ice flow (compared to ~zero flow 2009 at this time) 2010 – 90 days (of ice flow), Ice Flow Start – day 100 http://rapidfire.sci.gsfc.nasa.gov/subsets/?subset=Arctic_r03c03.2010100.terra.500m.jpg Ice Flow End – ~day 255 Will the Flow End date be the same as 2009?, my own prediction is that this will be extended by at least a week due to the thinner ice now permeating in the Arctic basin around north of Greenland. It will be interesting to watch how this flow reversal will affect the region in the coming days, if it persists. another candidate for an short animation, I reckon, or am i being presumptuous?. The ice must flow.
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Jul 11, 2010