Climate change and leadership

Posted on 2013-01-21 by Brian Magi

Below is a wonderful quote from the President of the USA Barack Obama during his Inaugural Address today (source: Washington Post). It sounds like the USA is ready to start moving forward on much-needed federal action on global warming:

We will respond to the threat of climate change, knowing that the failure to do so would betray our children and future generations. Some may still deny the overwhelming judgment of science, but none can avoid the devastating impact of raging fires, and crippling drought, and more powerful storms. The path towards sustainable energy sources will be long and sometimes difficult. But America cannot resist this transition; we must lead it. We cannot cede to other nations the technology that will power new jobs and new industries – we must claim its promise. That is how we will maintain our economic vitality and our national treasure – our forests and waterways; our croplands and snowcapped peaks. That is how we will preserve our planet, commanded to our care by God. That’s what will lend meaning to the creed our fathers once declared.

I highlighted the quote because it has not been common to hear from the federal government about progressive action on mitigating the impacts of global warming. President Obama’s comments are, as I said before, much-needed. I hope all successive presidents maintain this viewpoint on global warming – it’s an issue that deletes party lines.

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Martin Luther King Jr and the pitfalls of technology

Posted on 2013-01-19 by Brian Magi

Teaching began for me this past week. Like most people, I like quotes. The most memorable quotes make you reflect and think and react all in the same instant. So quotes are a useful way to focus the theme of a lecture. This Monday, our university remembers the life efforts by Martin Luther King Jr. and here is a great quote by King himself seen through the lens of youtube or you can read with your brain:

When we look at modern man, we have to face the fact that modern man suffers from a kind of poverty of the spirit, which stands in glaring contrast to his scientific and technological abundance. We’ve learned to fly the air like birds, we’ve learned to swim the seas like fish, yet we haven’t learned to walk the Earth as brothers and sisters.

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News for prospective students in Fall 2013

Posted on 2013-01-12 by Brian Magi

I will have money to support a Masters degree student as a Teaching Assistant in Fall 2013 – full application (with letters of rec) is due 1 February 2013. Please read through the materials on my research page, starting with my page for Prospective Students. Feel free to email me of course (email listed in right side bar), but everything begins with the application to the graduate school.

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Weather for the weather community

Posted on 2013-01-08 by Brian Magi

7000 meteorologists and atmospheric scientists (like me) have converged on Austin Texas for the annual AMS meeting. I’ve seen some great talks already and met a lot of students interested in UNC Charlotte and many others that were pleasantly surprised that UNC Charlotte has Masters and PhD programs related to atmospheric sciences. but the big fun is that the weather gods are smiling on the weather community. Check out the image from NOAA SPC. spc-2013-01-08
I don’t have a good sense of the chances, but it’s always exciting to be in “slight risk” region! right now, middle of the day in Austin, the visibility is about a mile so i can’t look out my hotel window and see anything. Radar suggests that downtown Austin should get some convective precip shortly. Embarassing to say this, but I wish i’d brought an umbrella!

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2012 is the winner!

Posted on 2013-01-01 by Brian Magi

if each year is a competition to be hotter than the previous, then in the USA, 2012 is the winner! the final month of the year was unusually warm and didn’t even make the “competition” a close one. the exact numbers will roll in soon enough, but below is the visual comparison of December 2012 with the other two record hot months in the USA – March and July. The figures are from the HPRCC visualization tool and show temperature departure in degrees F
2012-mar-jul-decUsually NCDC finalizes its wonderfully complete monthly analysis by the first week of the month and since 2012 is such a special year in the 118 year historical temperature record, I like to imagine that the NCDC scientists will be putting in a little extra effort to highlight 2012 for December’s State of the Climate report. Regardless, while science relies on the numbers (quantitative analysis), qualitative analysis in this case is quite powerful. Comparing the colors, my first guess is that December’s anomalous warmth is similar to July’s anomalous warmth. Guessing is the hallmark of qualitative analysis, but my guess is testable (once the temperature data is finalized) and that’s why I’m throwing it out there. My second guess is that December 2012 was the warmest December on record to cap off the warmest year on record. Here is the figure from HPRCC showing the temperature departure for the year as a whole.YearTDeptUSAgain, this is a qualitative analysis, but remember from previous posts that in order for 2012 to NOT be the warmest year on record, December 2012 would have had to have been a record COLD December. This is clearly not the case. The record warm year was driven by the record warm months of March, July, and December as shown in the figure at the top.

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Science meeting in Austin Texas

Posted on 2012-12-18 by Brian Magi

If you’re an undergraduate in physics, math, or a related field, and thinking about graduate school options, my colleague Professor Manda Adams and I will be in Austin, Texas from January 5-11 2013 for the American Meteorological Society Student Conference and for the full professional conference. Send me an email if you want to meet up and talk about grad school at UNC Charlotte! Also, I will be presenting some of my research in global fire modeling on Thursday from 9:30-9:45am in this session. My presentation will be about the role that satellite-based lightning data plays in global fire modeling.

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USA in December remains much warmer than average

Posted on 2012-12-17 by Brian Magi

A blowout in sports – whether it’s baseball, football, basketball, or soccer – is usually boring to watch. By blowout, I mean a game when one team obliterates the other. You know, 14-2 in baseball, 40-7 in football, etc. But in climate, the month-to-month ups and downs in temperature departures, are one example when a blowout is actually more fascinating to watch than another month of the “climate normal“.

As I mentioned earlier, December 2012 is setting the year 2012 to be a blowout in terms of the “competition” between years to be the warmest on the 118 year record. Here’s the updated evolution of December 2012 temperature departures from figures I got from the HPRCC map maker and laced together for an animated look at the month.

The most obvious feature is the continuing large and positive temperature departures for most of the country. You have to be a little careful because the figures have shifting colorbars on the bottom. Dark red doesn’t mean the same thing on every figure, but the message is clear as day. December is much much warmer than usual. The last week or so has continued the trend, although you do see the effect of the cold frontal passage around December 11-12 in the animation. Stay tuned, but based on a quick look at long-term weather model forecasts, I wouldn’t expect a dramatic change in the weather regime until at least December 25.

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Temperature departures discussion

Posted on 2012-12-16 by Brian Magi

I wanted to have a reference for any posts that talk about temperature and temperature departure (aka: temperature anomaly). This post shows an example of the calculation of a “temperature departure”.

Temperature departure is referring to the difference between temperature in the given month and the average temperature of that month over a range of years. For example, as shown in the table below, the average temperature for the month of November 2012 in the USA was 44 F. I got this from NCDC time series data which I downloaded a couple of weeks ago. You can calculate an average November temperature as well if you choose different average periods. Using the NCDC data, I calculated the 1981-2010 and 1900-1999 average November data, also shown in the table below.

                     T (F)   TD 81-10 (F)   TD 00-99 (F)
 November 2012       44.05   +1.28          +2.03
 November 1981-2010  42.77   N/A            N/A
 November 1900-1999  42.01   N/A            N/A

How does November 2012 compare to past Novembers? Well, it doesn’t make much sense to choose just any November unless you have a specific reason, such as comparing November 2012 to November 2011 so you can remember why you wore a sweater on Thanksgiving last year and didn’t have to this year. From a climate standpoint, it’s more informative to choose a LOT of Novembers and average those November temperatures together. How many is enough? A good place to start is 30 years. This is the length of time that the climate system typically needs to average out natural variations in temperature, such as effects of El Nino-Southern Oscillation and the corresponding La Nina, cooling from a large volcanic eruptions like in 1991-1992, or a less famous (than El Nino) form of variability that affects regional or global temperatures. NCDC uses the last century as a time length for calculating the “average” temperature. HPRCC and NCDC also use the 30 year average period between 1981-2010 and call this the “Climate Normal”. Both are completely valid as long as you understand what the temperature in any particular month is being compared to. The temperature departure for November 2012 (TD in the table) is calculated as T in November 2012 (44.05 F) minus the average November temperature. Comparison to 1981-2010 gives 44.05 F minus 42.77 F = +1.28 F. Similarly, comparison of November 2012 to 1900-1999 gives 44.05 F minus 42.01 F = +2.03 F. Hence the USA had a +2 F temperature departure in November 2012, as pointed out in a different post.

A discussion of temperature departures is peppered with specific statements of time and space scales. In November 2012 then, nothing changes about the average temperature (44 F), but if we compare this to the climate normal of 1981-2010, we (most likely) get a different departure than we would compared to 1900-1999. This is clear in the table. More to the point, temperature departure is a relative metric and temperature is an absolute metric. Temperature departures are usually more informative since it’s hard to just remember if it’s a little cooler or warmer any particular month, but temperature itself is of course more intuitive.

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Shattering the temperature record?

Posted on 2012-12-11 by Brian Magi

Glancing through the temperature anomalies of the last year, it’s clear we’re heading – barrelling really – towards a record hot year. Temperature data is collected and archived very quickly through various climate centers. The High Plains Regional Climate Center (HPRCC) has a particularly fluid interface for quickly assessing the state of the climate over different time and space (or spatiotemporal) scales. The USA as a whole experienced a record hot March and July in 2012, as listed in the table here. Records weren’t broken in every single state of course, but the records were broken when all the temperatures were averaged together. Here’s the story though. December 2012 is set to be the final nail in the plaque on the wall that says “HOTTEST YEAR ON RECORD: 1998 2012” and at this point (9 days into the month), December 2012 will not only be the nail, but will help 2012 shatter the temperature record. Look at these anomalies figures produced using the HPRCC tool for March, July, and so far for December:



Without even reading a number, you know that the deep red color for the anomaly from December 1-9 implies that it’s much hotter than the average temperature for December 1-9**. There’s hardly a speck of any the green or yellow that represents near normal temperature! But let’s not overreact. Whether this early trend will continue depends on the weather. All things being equal, weather over the entire month will probably moderate the unusual warmth seen so far in December. However, human activities have fundamentally changed how the concept of “all things being equal” applies to weather, so better to look at what weather models are saying rather than just assuming… Near-term weather forecasts suggests that the first half of the month will be more of the same. Long-term weather forecasts for the month (for example, clicking on the options for 100 hr+ forecast times) suggest a nor’easter may develop around Dec 16 and subsequently affect the mid-Atlantic Dec 17-18, but even that weather system seems to bring rain rather than snow (use the same forecast tool and “precip type” option to see that). Regardless, there is no chance of widespread snowmen to cool things down before at least December 15. Odds are in favor of a shattered temperature record on New Years Day.

*on record is the 118 year temperature record
**1981-2010 is the period that any month on the 118 year record is compared to. HPRCC call it the Climate Normal. NOAA NCDC call it the base period. Both use the same range of 30 years, which is a typical length of a climate-relevant – as opposed to weather – temperature dataset

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2012 Temperatures in North Carolina and USA

Posted on 2012-12-08 by Brian Magi

The big news, if you’re paying attention the inexorable increase in temperatures, is that the biggest contributor to fossil fuel carbon (the USA) is experiencing the hottest year in 118 years. We have one month remaining this year, but the record will be set unless the USA suddenly experiences the coldest December in 118 years (it won’t – we’re well on our way to a warmer than average December and there’s a weak-moderate El Nino in place right now too which tends to result in more mild winters for at least part of the USA). Certainly many locations in the contiguous USA will be cold, but it’s not the cold that matters though. It’s the comparison of the current temperature to an average of past temperatures that really highlights relative warmth or cold. Mining what has quickly become my favorite climate data source, at least for the USA, i went to the NCDC website and pulled down the data to look at how temperatures of our home state compare to those of our home country. Here’s what I got:

             North Carolina   NC Climate Division 5*  Contiguous USA
  January    +2.9 (92)        +3.1 (94)               +5.8 (115)
 February    +2.7 (88)        +2.3 (83)               +3.9 (104)
    March    +8.7 (117)       +9.8 (117)              +8.8 (118)
    April    +1.1 (80)        +1.7 (88)               +3.7 (116)
      May    +2.9 (108)       +2.9 (106)              +3.3 (117)
     June    -1.5 (21)        -1.5 (26)               +2.1 (107)
     July    +3.2 (117)       +2.4 (111)              +3.3 (118)
   August    -0.4 (50)        -1.3 (22)               +1.7 (106)
September    -0.9 (47)        -1.6 (36)               +1.4 (96)
  October    -0.6 (54)        -1.5 (38)               -0.3 (46)
 November    -3.6 (11)        -3.6 (10)               +2.0 (99)
 December    TBD (TBD)        TBD (TBD)               TBD (TBD)

*includes Charlotte and Mecklenburg County

The numbers with the + and – are the anomaly (departure) of that month’s temperature from the 20th Century average for that month. The numbers in parentheses are how the particular month for the particular region ranks (118 is hottest, 1 is coldest following NCDC protocol). The regions are NC, a smaller part of NC that includes CharMeck, and the USA minus Hawaii and Alaska. So, if you’re from North Carolina and can’t wait to have the dinnertime conversation with your friend/relative about how global warming is a joke/hoax/conspiracy, here is what you do. Pull up that table and you can heartily agree that, yes, North Carolina has been cooler than average, particularly since August. CharMeck (middle column essentially) has pretty much been the same, maybe even cooler. But then there’s the USA. The USA had below average temperatures in October, but the warmth has otherwise been shockingly constant. March and July 2012 were both the hottest in the 118 year record. On January 1, it’ll be clear that the USA has been warmer than it has been in over a century. North Carolina has finished cooler than average, but as I pointed out before, it was the warmth in the beginning of the calendar year that set the stage. And GLOBAL warming has never been about the warming or cooling of a particular US State – it is the response of an entire planet to the energy imbalance imposed on it by human activities. The data is mounting up though and the temperature trends of regions like the USA are slowly creeping out of the noise of the day-to-day variability.

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