Global maps of HIRS 4, 5 and 6 trends were composed with the
standard error of the trend, the lag-1 correlation, and the years
needed for time series to reach the 95% confidence level.
Channel 4 and 5 trends seem to oppose each other and correlation
of the trend maps appears to be small. Channel 6 standard error
map gives the largest errors in the tropical convection zones,
so these errors may be related to cloud detection.

Channel 4 Global trend maps

Channel 5 Global trend maps

Channel 6 Global trend maps

Zonal mean time series for HIRS 4, 5 and 6 are given for 5
separate zonal bands. Trend lines are shown as dashed lines and
the zonal time series are also smoothed with a 13-month running
mean filter. As was shown with the global maps, channel 4 shows
a positive temperature trend in the tropics while channel 5
shows a negative trend. Channel 6 gives very little trend for
these latitude zones.

Channel 4 Global trend maps

Channel 5 Global trend maps

Channel 6 Global trend maps

Tables of trend statistics are given for the zonal times series given above. The lag-1 (T) is the lag-1 autocorrelation with the trend in the time series. Yrs Sig indicates the number of years the time series would need to extend to meet the 95% confidence level.

Trend (K/10yr) | Intercept (K) | StdErr (K) | Lag-1 | Lag-1 (T) | Yrs Sig (yrs) | |

10N-10S | 0.7463 | -0.0373 | 0.0104 | 0.7812 | 0.7842 | 63.7 |

30N-30S | 0.7221 | -0.0339 | 0.0081 | 0.7484 | 0.7525 | 55.0 |

60N-60S | 0.3030 | -0.0090 | 0.0044 | 0.6851 | 0.6867 | 65.7 |

45N-25N | 0.0715 | 0.0103 | 0.0043 | 0.5180 | 0.5179 | 168.8 |

45S-25S | -0.0234 | 0.0146 | 0.0037 | 0.4978 | 0.4978 | 320.9 |

Trend (K/10yr) | Intercept (K) | StdErr (K) | Lag-1 | Lag-1 (T) | Yrs Sig (yrs) | |

10N-10S | -1.6778 | 0.1368 | 0.0051 | 0.5946 | 0.6350 | 23.1 |

30N-30S | -1.7234 | 0.1440 | 0.0037 | 0.5598 | 0.6350 | 18.5 |

60N-60S | -0.8163 | 0.0736 | 0.0021 | 0.3594 | 0.4162 | 20.4 |

45N-25N | -0.5404 | 0.0620 | 0.0033 | 0.3748 | 0.3875 | 36.5 |

45S-25S | -0.8473 | 0.0798 | 0.0024 | 0.2413 | 0.2854 | 21.8 |

Trend (K/10yr) | Intercept (K) | StdErr (K) | Lag-1 | Lag-1 (T) | Yrs Sig (yrs) | |

10N-10S | -0.1250 | 0.0087 | 0.0052 | 0.6143 | 0.6142 | 132.2 |

30N-30S | -0.0649 | 0.0102 | 0.0042 | 0.6694 | 0.6693 | 176.4 |

60N-60S | 0.0740 | 0.0016 | 0.0020 | 0.4083 | 0.4087 | 98.1 |

45N-25N | 0.8301 | -0.0392 | 0.0037 | 0.3524 | 0.3683 | 29.9 |

45S-25S | -0.2859 | 0.0339 | 0.0024 | 0.2406 | 0.2462 | 45.1 |

Last modified: Wed Mar 20 09:58:57 MST 2002